PR middle-end/70550
	* tree.h (OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT): Define.
	* gimplify.c (gimplify_adjust_omp_clauses_1): Set it for implicit
	firstprivate clauses.
	* omp-low.c (lower_send_clauses): Set TREE_NO_WARNING for
	OMP_CLAUSE_FIRSTPRIVATE_IMPLICIT !by_ref vars in task contexts.
	(lower_omp_target): Set TREE_NO_WARNING for
	non-addressable possibly uninitialized vars which are copied into
	addressable temporaries or copied for GOMP_MAP_FIRSTPRIVATE_INT.

	* c-c++-common/gomp/pr70550-1.c: New test.
	* c-c++-common/gomp/pr70550-2.c: New test.

From-SVN: r234779