re PR middle-end/29965 (OpenMP vs always throw in a loop)

re PR middle-end/29965 (OpenMP vs always throw in a loop)

	PR middle-end/29965
	* omp-low.c (determine_parallel_type): Don't try to optimize combined
	parallels if region->exit or region->inner->exit is NULL.
	(expand_omp_parallel): Handle NULL region->exit even if cfg is already
	built.
	(expand_omp_for_generic): Handle NULL region->cond and region->exit.
	(expand_omp_for): Use expand_omp_for_generic if either region->cond
	or region->exit is NULL.
	(expand_omp_sections): Handle NULL region->cond or region->exit.
	(expand_omp_synch):

	* gcc.dg/gomp/pr29965-1.c: New test.
	* gcc.dg/gomp/pr29965-2.c: New test.
	* gcc.dg/gomp/pr29965-3.c: New test.
	* gcc.dg/gomp/pr29965-4.c: New test.
	* gcc.dg/gomp/pr29965-5.c: New test.
	* gcc.dg/gomp/pr29965-6.c: New test.
	* g++.dg/gomp/pr29965-1.C: New test.
	* g++.dg/gomp/pr29965-2.C: New test.
	* g++.dg/gomp/pr29965-3.C: New test.
	* g++.dg/gomp/pr29965-4.C: New test.
	* g++.dg/gomp/pr29965-5.C: New test.
	* g++.dg/gomp/pr29965-6.C: New test.
	* g++.dg/gomp/pr29965-7.C: New test.
	* g++.dg/gomp/pr29965-8.C: New test.
	* g++.dg/gomp/pr29965-9.C: New test.
	* g++.dg/gomp/pr29965-10.C: New test.

From-SVN: r119483