re PR c++/88203 (assert does not compile with OpenMP's pragma omp parallel for default(none))

	PR c++/88203
c-family/
	* c-common.h (c_omp_predefined_variable): Declare.
	* c-omp.c (c_omp_predefined_variable): New function.
	(c_omp_predetermined_sharing): Return OMP_CLAUSE_DEFAULT_SHARED
	for predefined variables.
c/
	* c-parser.c (c_parser_predefined_identifier): New function.
	(c_parser_postfix_expression): Use it.
	(c_parser_omp_variable_list): Parse predefined identifiers.
	* c-typeck.c (c_finish_omp_clauses): Allow predefined variables
	in shared and firstprivate clauses, even when they are predetermined
	shared.
cp/
	* parser.c (cp_parser_omp_var_list_no_open): Parse predefined
	variables.
	* semantics.c (finish_omp_clauses): Allow predefined variables in
	shared and firstprivate clauses, even when they are predetermined
	shared.
	* cp-gimplify.c (cxx_omp_predetermined_sharing_1): Return
	OMP_CLAUSE_DEFAULT_SHARED for predefined variables.
testsuite/
	* c-c++-common/gomp/pr88203-1.c: New test.
	* c-c++-common/gomp/pr88203-2.c: New test.
	* c-c++-common/gomp/pr88203-3.c: New test.

From-SVN: r276212