re PR libgomp/32468 (number of threads in a parallel region depends on number of SECTIONs and MAX_THREADS)

	PR libgomp/32468
	* omp-low.c (check_combined_parallel): New function.
	(lower_omp_parallel): Call it via walk_stmts, set
	OMP_PARALLEL_COMBINED if appropriate.
	(determine_parallel_type): If OMP_FOR resp. OMP_SECTIONS
	isn't the only statement in WS_ENTRY_BB or OMP_RETURN
	the only one in PAR_EXIT_BB and not OMP_PARALLEL_COMBINED,
	don't consider it as combined parallel.

	* gcc.dg/gomp/pr32468-1.c: New test.

From-SVN: r126226