C: Do not drop qualifiers in typeof for _Atomic types. [PR65455,PR92935]

C: Do not drop qualifiers in typeof for _Atomic types. [PR65455,PR92935]

2020-11-25  Martin Uecker  <muecker@gwdg.de>

gcc/c/
	PR c/65455
	PR c/92935
	* c-parser.c (c_parser_declaration_or_fndef): Remove
	redundant code to drop qualifiers of _Atomic types for __auto_type.
	(c_parser_typeof_specifier): Do not drop qualifiers of _Atomic
	types for __typeof__.

gcc/
	PR c/65455
	PR c/92935
	* ginclude/stdatomic.h: Use comma operator to drop qualifiers.

gcc/testsuite/
	PR c/65455
	PR c/92935
	* gcc.dg/typeof-2.c: Adapt test.