We're going to start using gnulib in the sim, so make sure it exists.

ChangeLog:

	* Makefile.def: Add configure-sim dependency on all-gnulib.
	* Makefile.in: Regenerated.

Long ago we were forced to make some small ABI breaks to correct errors
in the implementation, and we added warning messages for the changes
from GCC 4.9 to GCC 5.  Enough time has passed that these are now just
irritants, so let's remove them.  Also clean up associated macros using
rs6000_special_adjust_field_align_p, which has been always returning
false for a long time.

2021-05-18  Bill Schmidt  <wschmidt@linux.ibm.com>

gcc/
	* config/rs6000/freebsd64.h (ADJUST_FIELD_ALIGN): Remove call to
	rs6000_special_adjust_field_align_p.
	* config/rs6000/linux64.h (ADJUST_FIELD_ALIGN): Likewise.
	* config/rs6000/rs6000-call.c (rs6000_function_arg_boundary):
	Remove ABI warning.
	(rs6000_function_arg): Likewise.
	* config/rs6000/rs6000-protos.h
	(rs6000_special_adjust_field_align_p): Remove prototype.
	* config/rs6000/rs6000.c (rs6000_special_adjust_field_align_p):
	Remove.
	* config/rs6000/sysv4.h (ADJUST_FIELD_ALIGN): Remove call to
	rs6000_special_adjust_field_align_p.

gcc/testsuite/
	* gcc.target/powerpc/ppc64-abi-warn-1.c: Remove.
	* gcc.target/powerpc/ppc64-abi-warn-2.c: Remove.
	* gcc.target/powerpc/ppc64-abi-warn-3.c: Remove.

gcc/d/ChangeLog:

	* d-incpath.cc (prefixed_path): Use filename_ncmp instead of strncmp.

gcc/d/ChangeLog:

	* types.cc (TypeVisitor::visit (TypeEnum *)): Use startswith function
	instead of strncmp.

This reverts changes to the DMD front-end in commit
6ba3079d.

Changes were incorrectly committed directly to the GCC repo instead of
the master repository.

gcc/d/ChangeLog:

	* dmd/dinterpret.c (evaluateIfBuiltin): Revert last change.
	* dmd/dmangle.c: Likewise.
	* dmd/hdrgen.c: Likewise.
	* dmd/identifier.c (Identifier::toHChars2): Likewise.

I was looking at the LCOV coverage report for the C++ FE and
found a bunch of unused functions that I think we can remove.
Obviously, I left alone various dump_* and debug_* routines.
I haven't removed cp_build_function_call although it is also
currently unused.

* lambda_return_type: was used in parser.c in GCC 7, unused since r255950,
* classtype_has_non_deleted_copy_ctor: appeared in GCC 10, its usage
  was removed in c++/95350,
* contains_wildcard_p: used in GCC 9, unused since r276764,
* get_template_head_requirements: seems to never have been used,
* check_constrained_friend: seems to never have been used,
* subsumes_constraints: unused since r276764,
* push_void_library_fn: usage removed in r248328,
* get_template_parms_at_level: unused since r157857,
* get_pattern_parm: unused since r275387.

(Some of the seemingly unused functions, such as set_global_friend, are
actually used in libcc1.)

gcc/cp/ChangeLog:

	* class.c (classtype_has_non_deleted_copy_ctor): Remove.
	* constraint.cc (contains_wildcard_p): Likewise.
	(get_template_head_requirements): Likewise.
	(check_constrained_friend): Likewise.
	(subsumes_constraints): Likewise.
	* cp-tree.h (classtype_has_non_deleted_copy_ctor): Likewise.
	(push_void_library_fn): Likewise.
	(get_pattern_parm): Likewise.
	(get_template_parms_at_level): Likewise.
	(lambda_return_type): Likewise.
	(get_template_head_requirements): Likewise.
	(check_constrained_friend): Likewise.
	(subsumes_constraints): Likewise.
	* decl.c (push_void_library_fn): Likewise.
	* lambda.c (lambda_return_type): Likewise.
	* pt.c (get_template_parms_at_level): Likewise.
	(get_pattern_parm): Likewise.

This test was fixed by my second patch for PR93314, which distinguishes
between constant-expression and potentially-constant-evaluated contexts in a
way that my first patch did not.

	PR c++/100205
	PR c++/99314

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/decltype-nonstatic1.C: New test.

Here we were ignoring the template constructor because the implicit move
constructor had all perfect conversions.  But CWG1402 says that an
implicitly deleted move constructor is ignored by overload resolution; we
implement that instead by preferring any other candidate in joust, to get
better diagnostics, but that means we need to handle that case here as well.

gcc/cp/ChangeLog:

	PR c++/100644
	* call.c (perfect_candidate_p): An implicitly deleted move
	is not perfect.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp0x/implicit-delete1.C: New test.

PR analyzer/100615 reports a missing leak diagnostic.
The issue is that the code calls strsep which the analyzer doesn't
have special knowledge of, and so conservatively assumes that it
could free the pointer, so drops malloc state for it.

Properly "teaching" the analyzer about strsep would require it
to support bifurcating state at a call, which is currently fiddly to
do, so for now this patch notes that strsep doesn't affect the
malloc state machine, allowing the analyzer to correctly detect the leak.

gcc/analyzer/ChangeLog:
	PR analyzer/100615
	* sm-malloc.cc: Include "analyzer/function-set.h".
	(malloc_state_machine::on_stmt): Call unaffected_by_call_p and
	bail on the functions it recognizes.
	(malloc_state_machine::unaffected_by_call_p): New.

gcc/testsuite/ChangeLog:
	PR analyzer/100615
	* gcc.dg/analyzer/pr100615.c: New test.

Add infrastructure, logic and arithmetic support for 4-byte vectors.
These can be used with SSE2 targets, where movd instructions from/to
XMM registers are available.  x86_64 ABI passes 4-byte vectors in
integer registers, so also add logic operations with integer registers.

2021-05-18  Uroš Bizjak  <ubizjak@gmail.com>

gcc/
	PR target/100637
	* config/i386/i386.h (VALID_SSE2_REG_MODE):
	Add V4QI and V2HI modes.
	(VALID_INT_MODE_P): Ditto.
	* config/i386/mmx.md (VI_32): New mode iterator.
	(mmxvecsize): Handle V4QI and V2HI.
	(Yv_Yw): Ditto.
	(mov<VI_32:mode>): New expander.
	(*mov<mode>_internal): New insn pattern.
	(movmisalign<VI_32:mode>): New expander.
	(neg<VI_32:mode>): New expander.
	(<plusminus:insn><VI_32:mode>3): New expander.
	(*<plusminus:insn><VI_32:mode>3): New insn pattern.
	(mulv2hi3): New expander.
	(*mulv2hi3): New insn pattern.
	(one_cmpl<VI_32:mode>2): New expander.
	(*andnot<VI_32:mode>3): New insn pattern.
	(<any_logic:code><VI_32:mode>3): New expander.
	(*<any_logic:code><VI_32:mode>3): New insn pattern.

gcc/testsuite/

	PR target/100637
	* gcc.target/i386/pr100637-1b.c: New test.
	* gcc.target/i386/pr100637-1w.c: Ditto.

	* gcc.target/i386/pr92658-avx2-2.c: Do not XFAIL scan for pmovsxbq.
	* gcc.target/i386/pr92658-avx2.c: Do not XFAIL scan for pmovzxbq.
	* gcc.target/i386/pr92658-avx512vl.c: Do not XFAIL scan for vpmovdb.
	* gcc.target/i386/pr92658-sse4-2.c: Do not XFAIL scan for
	pmovsxbd and pmovsxwq.
	* gcc.target/i386/pr92658-sse4.c: Do not XFAIL scan for
	pmovzxbd and pmovzxwq.

Nothing in gcc or binutils or gdb or anything anywhere uses these.

config/

	* acinclude.m4 (CYG_AC_PATH_SIM, CYG_AC_PATH_DEVO): Delete.

	PR fortran/100642

gcc/fortran/ChangeLog:

	* openmp.c (omp_code_to_statement): Add missing EXEC_OMP_DEPOBJ.

gcc/testsuite/ChangeLog:

	* gfortran.dg/goacc-gomp/depobj.f90: New test.

In the earlier commit r12-854 I forgot to also rewrite the other operator-
overload in terms of the split-out member function _M_distance_from.

libstdc++-v3/ChangeLog:

	PR libstdc++/100631
	* include/std/ranges (elements_view::_Sentinel::operator-): Use
	_M_distance_from in the other operator- overload too.
	* testsuite/std/ranges/adaptors/elements.cc (test06): Augment test.

Fix a mode mismatch.

2021-05-18  Uroš Bizjak  <ubizjak@gmail.com>

gcc/
	* config/i386/sse.md (<any_extend:insn>v4qiv4di2):
	Fix a mode mismatch with operand 1.

split_double_mode calls simplify_gen_subreg, which fails for the
high half of the paradoxical subreg.  Return temporary register
instead of NULL RTX in this case.

2021-05-18  Uroš Bizjak  <ubizjak@gmail.com>

gcc/
	PR target/100626
	* config/i386/i386-expand.c (split_double_mode): Return
	temporary register when simplify_gen_subreg fails with
	the high half od the paradoxical subreg.

This avoids setting TREE_ADDRESSABLE on variables we want to force to
the stack.  Instead track those in a temporary bitmap and force
stack expansion that way, leaving TREE_ADDRESSABLE alone, not
pessimizing future alias queries.

2021-05-17  Richard Biener  <rguenther@suse.de>

	* cfgexpand.c (expand_one_var): Pass in forced_stack_var
	and honor it when expanding.
	(expand_used_vars_for_block): Pass through forced_stack_var.
	(expand_used_vars): Likewise.
	(discover_nonconstant_array_refs_r): Set bits in
	forced_stack_vars instead of marking vars TREE_ADDRESSABLE.
	(avoid_type_punning_on_regs): Likewise.
	(discover_nonconstant_array_refs): Likewise.
	(pass_expand::execute): Create and pass down forced_stack_var
	bitmap.  For parameters and returns temporarily set
	TREE_ADDRESSABLE when expand_function_start.

See local 'offload_targets' variable in
'libgomp/testsuite/lib/libgomp.exp:libgomp_check_effective_target_offload_target'
vs. global 'libgomp/testsuite/libgomp-test-support.exp.in:offload_targets'
variable.

	libgomp/
	* testsuite/lib/libgomp.exp
	(check_effective_target_offload_target_nvptx): Don't shadow global
	'offload_targets' variable.

Fix-up for recent commit 33b64795
"OpenMP: Fix SIMT for complex/float reduction with && and ||"; see
commit d42088e4 "Avoid -latomic for amdgcn
offloading".

	libgomp/
	* testsuite/libgomp.c-c++-common/reduction-5.c: Restrict
	'-latomic' to nvptx offloading compilation.
	* testsuite/libgomp.c-c++-common/reduction-6.c: Likewise.

Fix-up for recent commit f87990a2
"[openmp, simt] Disable SIMT for user-defined reduction"; see commit
d42088e4 "Avoid -latomic for amdgcn
offloading".

	libgomp/
	* testsuite/libgomp.c/target-44.c: Restrict '-latomic' to nvptx
	offloading compilation.

That's 'dg-message "note: [...]"' with a twist: inhibit default notes pruning,
such that "if 'dg-note' is used at least once in a testcase, [notes] are not
pruned and instead must *all* be handled explicitly".

The rationale is that either you're not interested in notes at all (default
behavior of pruning all notes), but often, when you're interested in one note,
you're in fact interested in all notes, and especially interested if
*additional* notes appear over time, as GCC evolves.

	gcc/testsuite/
	* lib/gcc-dg.exp: Implement 'dg-note'.
	* lib/prune.exp: Likewise.
	* gcc.dg/vect/nodump-vect-opt-info-2.c: Use 'dg-note', and
	'dg-prune-output "note: ".
	* gfortran.dg/goacc/routine-external-level-of-parallelism-2.f: Use
	'dg-note', match up additional notes, one class of them with
	XFAILed 'dg-bogus'.
	* lib/lto.exp: Implement 'dg-lto-note'.
	* g++.dg/lto/odr-1_0.C: Use 'dg-lto-note', match up additional
	notes.
	* g++.dg/lto/odr-1_1.C: Likewise.
	* g++.dg/lto/odr-2_1.C: Likewise.
	libstdc++-v3/
	* testsuite/lib/prune.exp: Add note about 'dg-note'.
	gcc/
	* doc/sourcebuild.texi: Document 'dg-note'.

BUILD_CFLAGS is set by configure; by default, BUILD_CFLAGS = $(ALL_CFLAGS)
is used. The latter contains (see gcc/Makefile.in) $(CFLAGS-$@), which is used
to pass .o-file specific flags to the compiler.
For cross builds, BUILD_CFLAGS is constructed in configure{,.ac} and missed
the $(CFLAGS-$@) - despite the comment above ALL_CFLAGS that configure.ac
might have to kept in sync.

gcc/ChangeLog:

	PR other/100598
	* configure: Regenerate.
	* configure.ac (BUILD_CFLAG, BUILD_CXXFLAGS): Add $(CFLAGS-$@).

No overall change in behavior.

	gcc/
	* gimple.h (is_gimple_omp_oacc): Tighten.
	* omp-low.c (check_omp_nesting_restrictions): Adjust.

This applies some TLC to mark_address_taken which ends up setting
TREE_ADDRESSABLE on nodes where it doesn't have any semantics.
It also does work (incomplete) that get_base_address already does,
likewise we'll never get WITH_SIZE_EXPR in this context and thus
get_base_address never fails.

2021-05-18  Richard Biener  <rguenther@suse.de>

	* tree-ssa-operands.c (mark_address_taken): Simplify.

gcc/ChangeLog:

	* config/gcn/mkoffload.c (STR): Redefine.
	* config/i386/intelmic-mkoffload.c (STR): Likewise.
	* config/nvptx/mkoffload.c (STR): Likewise.

contrib/ChangeLog:

	* gcc-changelog/git_email.py: Remove use of non-strict mode.

gcc/ChangeLog:

	* common/config/aarch64/aarch64-common.c (aarch64_parse_extension):
	Use startswith function instead of strncmp.
	* common/config/bfin/bfin-common.c (bfin_handle_option): Likewise.
	* common/config/riscv/riscv-common.c (riscv_subset_list::parse): Likewise.
	* config/aarch64/aarch64-sve-builtins-shapes.cc (parse_type): Likewise.
	* config/aarch64/aarch64.c (aarch64_process_one_target_attr): Likewise.
	* config/alpha/alpha.c (alpha_elf_section_type_flags): Likewise.
	* config/arm/aarch-common.c (arm_md_asm_adjust): Likewise.
	* config/arm/arm.c (arm_file_start): Likewise.
	(arm_valid_target_attribute_rec): Likewise.
	(thumb1_md_asm_adjust): Likewise.
	* config/arm/driver-arm.c (host_detect_local_cpu): Likewise.
	* config/avr/avr.c (STR_PREFIX_P): Likewise.
	(avr_set_current_function): Likewise.
	(avr_handle_addr_attribute): Likewise.
	(avr_asm_output_aligned_decl_common): Likewise.
	(avr_asm_named_section): Likewise.
	(avr_section_type_flags): Likewise.
	(avr_asm_select_section): Likewise.
	* config/c6x/c6x.c (c6x_in_small_data_p): Likewise.
	(c6x_section_type_flags): Likewise.
	* config/darwin-c.c (darwin_cfstring_ref_p): Likewise.
	(darwin_objc_declare_unresolved_class_reference): Likewise.
	(darwin_objc_declare_class_definition): Likewise.
	* config/darwin.c (indirect_data): Likewise.
	(darwin_encode_section_info): Likewise.
	(darwin_objc2_section): Likewise.
	(darwin_objc1_section): Likewise.
	(machopic_select_section): Likewise.
	(darwin_globalize_label): Likewise.
	(darwin_label_is_anonymous_local_objc_name): Likewise.
	(darwin_asm_named_section): Likewise.
	(darwin_asm_output_dwarf_offset): Likewise.
	* config/frv/frv.c (frv_string_begins_with): Likewise.
	(frv_in_small_data_p): Likewise.
	* config/gcn/mkoffload.c (STR): Likewise.
	(main): Likewise.
	* config/i386/i386-builtins.c (get_builtin_code_for_version): Likewise.
	* config/i386/i386-options.c (ix86_option_override_internal): Likewise.
	* config/i386/i386.c (x86_64_elf_section_type_flags): Likewise.
	(ix86_md_asm_adjust): Likewise.
	* config/i386/intelmic-mkoffload.c (STR): Likewise.
	* config/i386/winnt.c (i386_pe_asm_named_section): Likewise.
	(i386_pe_file_end): Likewise.
	* config/ia64/ia64.c (ia64_in_small_data_p): Likewise.
	(ia64_section_type_flags): Likewise.
	* config/mips/driver-native.c (host_detect_local_cpu): Likewise.
	* config/mips/mips.c (mips_handle_interrupt_attr): Likewise.
	(mips16_stub_function_p): Likewise.
	(mips_function_rodata_section): Likewise.
	* config/msp430/msp430.c (msp430_mcu_name): Likewise.
	(msp430_function_section): Likewise.
	(msp430_section_type_flags): Likewise.
	(msp430_expand_helper): Likewise.
	* config/nios2/nios2.c (nios2_small_section_name_p): Likewise.
	(nios2_valid_target_attribute_rec): Likewise.
	* config/nvptx/mkoffload.c (process): Likewise.
	(STR): Likewise.
	* config/pa/som.h: Likewise.
	* config/pdp11/pdp11.c (pdp11_output_ident): Likewise.
	* config/riscv/riscv.c (riscv_elf_select_rtx_section): Likewise.
	* config/rs6000/rs6000.c (VTABLE_NAME_P): Likewise.
	(rs6000_inner_target_options): Likewise.
	* config/s390/driver-native.c (s390_host_detect_local_cpu): Likewise.
	* config/sparc/driver-sparc.c (host_detect_local_cpu): Likewise.
	* config/vax/vax.c (vax_output_int_move): Likewise.
	* config/vms/vms-ld.c (startswith): Likewise.
	(process_args): Likewise.
	(main): Likewise.
	* config/vms/vms.c: Likewise.

The following testcase ICEs, because copyprop_hardreg_forward_1 decides
to DCE asm goto with REG_UNUSED notes (because the output is unused and
asm isn't volatile).  But that DCE just removes the asm goto, leaving
a bb with two successors and no insn at the end that would allow that.

The following patch makes sure we drop that way only INSNs and not
JUMP_INSNs or CALL_INSNs.

2021-05-18  Jakub Jelinek  <jakub@redhat.com>

	PR rtl-optimization/100590
	* regcprop.c (copyprop_hardreg_forward_1): Only DCE dead sets if
	they are NONJUMP_INSN_P.

	* gcc.dg/pr100590.c: New test.

Last year I've added cgraph_node::get_create calls for the dummy
functions used for -fdump-passes, so that it interacts well with pass
disabling/enabling which is cgraph uid based.
Unfortunately, as the following testcase shows, when assembler hash
is present, that wants to compute DECL_ASSEMBLER_NAME and the C++ FE
is unprepared to handle it on the dummy functions which don't have
DECL_NAME etc.
The following patch fixes it by setting up a dummy DECL_ASSEMBLER_NAME
on these, so that the FEs don't need to compute it.

2021-05-18  Jakub Jelinek  <jakub@redhat.com>

	PR c++/100580
	* function.c (push_dummy_function): Set DECL_ARTIFICIAL and
	DECL_ASSEMBLER_NAME on the fn_decl.

	* g++.dg/other/pr100580.C: New test.

As mentioned earlier, spaceship_replacement didn't optimize partial_ordering
>= 0 comparisons, because the possible values are -1, 0, 1, 2 and the
>= comparison is implemented as (res & 1) == res to choose the 0 and 1
cases from that.  As we optimize that only with -ffinite-math-only, the
2 case is assumed not to happen and my earlier match.pd change optimizes
(res & 1) == res into (res & ~1) == 0, so this patch pattern matches
that case and handles it like res >= 0.

2021-05-18  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/94589
	* tree-ssa-phiopt.c (spaceship_replacement): Pattern match
	phi result used in (res & ~1) == 0 comparison as res >= 0 as
	res == 2 would be UB with -ffinite-math-only.

	* g++.dg/opt/pr94589-2.C: Adjust scan-tree-dump count from 14 to 12.

gcc/ChangeLog:

	* Makefile.in: genversion.o should depend on DATESTAMP.

gcc/
2021-05-18  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/simdext.md (negv2si2): Remove round bracket.

Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>

Which generates vpblendmb.

2021-05-18  Richard Biener  <rguenther@suse.de>

gcc/testsuite/
	* gcc.target/i386/pr100582.c: Adjust for AVX512.

This plugs a few easy holes avoiding ICEs down the route.

2021-05-18  Richard Biener  <rguenther@suse.de>

	PR c/100522
gcc/c/
	* gimple-parser.c (c_parser_gimple_postfix_expression_after_primary):
	Diagnose calls to non-functions.
	(c_parser_gimple_statement): Diagnose unexpected assignment RHS.

gcc/testsuite/
	* gcc.dg/gimplefe-error-10.c: New testcase.

This rejects a number of vector components that does not fit an 'int'
which is an internal limitation of RTVEC.  This requires adjusting
gcc.dg/attr-vector_size.c which checks for much larger
supported vectors.  Note that the RTVEC limitation is a host specific
limitation (unless we change this 'int' to int32_t), but should be
32bits in practice everywhere.

2021-05-12  Richard Biener  <rguenther@suse.de>

	PR c/100547
gcc/c-family/
	* c-attribs.c (type_valid_for_vector_size): Reject too large nunits.
	Reword existing nunit diagnostic.

gcc/testsuite/
	* gcc.dg/pr100547.c: New testcase.
	* gcc.dg/attr-vector_size.c: Adjust.

_Bool needs to be defined as macro in order to trigger the
context-sensitive macro expansion mechanism.

gcc/ChangeLog:

	* config/s390/s390-c.c (s390_cpu_cpp_builtins_internal): Define
	_Bool as macro expanding to _Bool.

gcc/testsuite/ChangeLog:

	* gcc.target/s390/zvector/vec-_Bool.c: New test.

The problem appears to be triggered by two locations in the front-end
where non-POINTER_SIZE pointers aren't handled right now.

1. An assertion in strip_typedefs is triggered because the alignment
of the types don't match. This in turn is caused by creating the new
type with build_pointer_type instead of taking the type of the
original pointer into account.

2. An assertion in cp_convert_to_pointer is triggered which expects
the target type to always have POINTER_SIZE.

gcc/cp/ChangeLog:

	PR c++/100281
	* cvt.c (cp_convert_to_pointer): Use the size of the target
	pointer type.
	* tree.c (cp_build_reference_type): Call
	cp_build_reference_type_for_mode with VOIDmode.
	(cp_build_reference_type_for_mode): Rename from
	cp_build_reference_type.  Add MODE argument and invoke
	build_reference_type_for_mode.
	(strip_typedefs): Use build_pointer_type_for_mode and
	cp_build_reference_type_for_mode for pointers and references.

gcc/ChangeLog:

	PR c++/100281
	* tree.c (build_reference_type_for_mode)
	(build_pointer_type_for_mode): Pick pointer mode if MODE argument
	is VOIDmode.
	(build_reference_type, build_pointer_type): Invoke
	build_*_type_for_mode with VOIDmode.

gcc/testsuite/ChangeLog:

	PR c++/100281
	* g++.target/s390/pr100281-1.C: New test.
	* g++.target/s390/pr100281-2.C: New test.

This makes the in-place constructor of our partial specialization of
__box for already-semiregular types perform direct-non-list-initialization
(in accordance with the specification of the primary template), and
additionally makes the member function data() use std::__addressof.

libstdc++-v3/ChangeLog:

	PR libstdc++/100475
	* include/std/ranges (__box::__box): Use non-list-initialization
	in member initializer list of in-place constructor of the
	partial specialization for semiregular types.
	(__box::operator->): Use std::__addressof.
	* testsuite/std/ranges/adaptors/detail/semiregular_box.cc
	(test02): New test.
	* testsuite/std/ranges/single_view.cc (test04): New test.

A range being a random access range isn't a sufficient condition for
ranges::next(iter, sent) to have constant time complexity -- it must
also have a sized sentinel.  This adjusts the memoization condition for
reverse_view accordingly.

libstdc++-v3/ChangeLog:

	PR libstdc++/100621
	* include/std/ranges (reverse_view::_S_needs_cached_begin):
	Set to true if the underlying non-common random-access range
	doesn't have a sized sentinel.

libstdc++-v3/ChangeLog:

	PR libstdc++/100631
	* include/std/ranges (elements_view::_Iterator): Also befriend
	_Sentinel<!_Const>.
	(elements_view::_Sentinel::_M_equal): Templatize.
	(elements_view::_Sentinel::_M_distance_from): Split out from ...
	(elements_view::_Sentinel::operator-): ... here.  Depend on
	_Base2 instead of _Base in the return type.
	* testsuite/std/ranges/adaptors/elements.cc (test06, test07):
	New tests.