diagnostics: use "%e" to avoid intermediate strings [PR116613]

Various diagnostics build an intermediate string, potentially with
colorization, and then use this in a diagnostic message.

This won't work if we have multiple diagnostic sinks, where some might
be colorized and some not.

This patch reworks such places using "%e" and pp_element subclasses, so
that any colorization happens within report_diagnostic's call to
pp_format.

gcc/analyzer/ChangeLog:
	PR other/116613
	* kf-analyzer.cc: Include "pretty-print-markup.h".
	(kf_analyzer_dump_escaped::impl_call_pre): Defer colorization
	choices by eliminating the construction of a intermediate string,
	replacing it with a new pp_element subclass via "%e".

gcc/ChangeLog:
	PR other/116613
	* attribs.cc: Include "pretty-print-markup.h".
	(decls_mismatched_attributes): Defer colorization choices by
	replacing printing to a pretty_printer * param with appending
	to a vec of strings.
	(maybe_diag_alias_attributes): As above, replacing pretty_printer
	with usage of pp_markup::comma_separated_quoted_strings and "%e"
	in two places.
	* attribs.h (decls_mismatched_attributes): Update decl.
	* gimple-ssa-warn-access.cc: Include "pretty-print-markup.h".
	(pass_waccess::maybe_warn_memmodel): Defer colorization choices by
	replacing printing to a pretty_printer * param with use of
	pp_markup::comma_separated_quoted_strings and "%e".
	(pass_waccess::maybe_warn_memmodel): Likewise, replacing printing
	to a temporary buffer.
	* pretty-print-markup.h
	(class pp_markup::comma_separated_quoted_strings): New.
	* pretty-print.cc
	(pp_markup::comma_separated_quoted_strings::add_to_phase_2): New.
	(selftest::test_pp_printf_within_pp_element): New.
	(selftest::test_comma_separated_quoted_strings): New.
	(selftest::pretty_print_cc_tests): Call the new tests.

gcc/cp/ChangeLog:
	PR other/116613
	* pt.cc: Include "pretty-print-markup.h".
	(warn_spec_missing_attributes): Defer colorization choices by
	replacing printing to a pretty_printer * param with appending
	to a vec of strings.  Replace pretty_printer with usage of
	pp_markup::comma_separated_quoted_strings and "%e".

gcc/testsuite/ChangeLog:
	PR other/116613
	* c-c++-common/analyzer/escaping-1.c: Update expected results to
	remove type information from C++ results.  Previously we were
	using %qD with default_tree_printer, which used
	lang_hooks.decl_printable_name, whereas now we're using %qD with
	a clone of the cxx_pretty_printer.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>