re PR middle-end/69916 ([openacc] ICE in single_succ_edge called from oacc_loop_xform...

re PR middle-end/69916 ([openacc] ICE in single_succ_edge called from oacc_loop_xform_loop)

	gcc/
	PR middle-end/69916
	* omp-low.c (struct oacc_loop): Add ifns.
	(new_oacc_loop_raw): Initialize it.
	(finish_oacc_loop): Clear mask & flags if no ifns.
	(oacc_loop_discover_walk): Count IFN_GOACC_LOOP calls.
	(oacc_loop_xform_loop): Add ifns arg & adjust.
	(oacc_loop_process): Adjust oacc_loop_xform_loop call.

	gcc/testsuite/
	PR middle-end/69916
	* c-c-++-common/goacc/pr69916.c: New.

From-SVN: r234026