PR c/51360
	* c-parser.c (c_parser_omp_clause_num_threads,
	c_parser_omp_clause_schedule): Call mark_exp_read.

	* semantics.c (finish_omp_clauses): For OMP_CLAUSE_NUM_THREADS_EXPR
	and OMP_CLAUSE_SCHEDULE_CHUNK_EXPR call mark_rvalue_use.

	* c-c++-common/gomp/pr51360.c: New test.
	* g++.dg/gomp/pr51360.C: New test.

From-SVN: r182381