C/C++: Simplify handling of location information for OpenACC routine directives

C/C++: Simplify handling of location information for OpenACC routine directives

	gcc/c/
	* c-parser.c (struct oacc_routine_data): New.
	(c_parser_declaration_or_fndef, c_parser_oacc_routine): Use it.
	Simplify code.
	(c_finish_oacc_routine): Likewise.  Don't attach clauses to "omp
	declare target" attribute.
	gcc/cp/
	* parser.h (struct cp_omp_declare_simd_data): New.
	(struct cp_parser): Use it for oacc_routine member.
	* parser.c (cp_ensure_no_oacc_routine, cp_parser_oacc_routine)
	(cp_parser_late_parsing_oacc_routine, cp_finalize_oacc_routine):
	Use it.  Simplify code.
	(cp_parser_new): Initialize all members pointing to special
	parsing data structures.
	(cp_parser_cilk_simd_fn_vector_attrs): Initialize
	parser->cilk_simd_fn_info->clauses.
	(cp_parser_omp_declare_simd): Initialize
	parser->omp_declare_simd->clauses.
	(cp_parser_late_parsing_omp_declare_simd): Simplify code.

From-SVN: r239127