re PR middle-end/54017 (Incorrect implementation of infinite loops in OpenMP sections leads to SIGILL)

	PR middle-end/54017
	* tree-cfgcleanup.c (cleanup_omp_return): Remove.
	(cleanup_tree_cfg_bb): Don't call it.
	* omp-low.c (expand_omp_sections): Fix up the !exit_reachable case
	handling.

	* c-c++-common/gomp/pr54017.c: New test.

From-SVN: r189658