d: Merge upstream dmd, druntime 17ccd12af3, phobos 8d3800bee.

D front-end changes:

	- Import dmd v2.104.0.
	- Assignment-style syntax is now allowed for `alias this'.
	- Overloading `extern(C)' functions is now an error.

D runtime changes:

	- Import druntime v2.104.0.

Phobos changes:

	- Import phobos v2.104.0.
	- Better static assert messages when instantiating
	`std.algorithm.iteration.permutations' with wrong inputs.
	- Added `std.system.instructionSetArchitecture' and
	  `std.system.ISA'.

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 17ccd12af3.
	* dmd/VERSION: Bump version to v2.104.0.
	* Make-lang.in (D_FRONTEND_OBJS): Rename d/apply.o to
	d/postordervisitor.o.
	* d-codegen.cc (make_location_t): Update for new front-end interface.
	(build_filename_from_loc): Likewise.
	(build_assert_call): Likewise.
	(build_array_bounds_call): Likewise.
	(build_bounds_index_condition): Likewise.
	(build_bounds_slice_condition): Likewise.
	(build_frame_type): Likewise.
	(get_frameinfo): Likewise.
	* d-diagnostic.cc (d_diagnostic_report_diagnostic): Likewise.
	* decl.cc (build_decl_tree): Likewise.
	(start_function): Likewise.
	* expr.cc (ExprVisitor::visit (NewExp *)): Replace code generation of
	`new pointer' with front-end lowering.
	* runtime.def (NEWITEMT): Remove.
	(NEWITEMIT): Remove.
	* toir.cc (IRVisitor::visit (LabelStatement *)): Update for new
	front-end interface.
	* typeinfo.cc (check_typeinfo_type): Likewise.

libphobos/ChangeLog:

	* libdruntime/MERGE: Merge upstream druntime 17ccd12af3.
	* src/MERGE: Merge upstream phobos 8d3800bee.

gcc/testsuite/ChangeLog:

	* gdc.dg/asm4.d: Update test.