re PR pch/54117 (FAIL: ./decl-3.h -O0 -g (internal compiler error))

re PR pch/54117 (FAIL: ./decl-3.h  -O0 -g (internal compiler error))

	PR pch/54117
	* c-opts.c (c_common_post_options): If debug info is enabled
	and non-dwarf*, refuse to load PCH files and when writing PCH
	file warn.

	* lib/dg-pch.exp (pch-init, pch-finish,
	check_effective_target_pch_supported_debug): New procs.
	(dg-flags-pch): If $pch_unsupported, make tests UNSUPPORTED.
	Likewise if $pch_unsupported_debug and $flags include -g.
	Skip FAILs about missing *.gch file if $pch_unsupported_debug
	and dg-require-effective-target pch_unsupported_debug.
	* g++.dg/pch/pch.exp: Call pch-init and pch-finish.
	* objc.dg/pch/pch.exp: Likewise.
	* gcc.dg/pch/pch.exp: Likewise.
	* gcc.dg/pch/valid-1.c: Add dg-require-effective-target
	pch_unsupported_debug.
	* gcc.dg/pch/valid-1.hs: Likewise.
	* gcc.dg/pch/valid-1b.c: Likewise.
	* gcc.dg/pch/valid-1b.hs: Likewise.

Co-Authored-By: Steven Bosscher <steven@gcc.gnu.org>
From-SVN: r196124