First do add_noreturn_fake_exit_edges in connect_infinite_loops_to_exit

First do add_noreturn_fake_exit_edges in connect_infinite_loops_to_exit

Most callers of connect_infinite_loops_to_exit already do this but
the few that do not end up with extra exit edges.  The following
makes that consistent, also matching the post-dominance DFS walk code.

2021-02-25  Richard Biener  <rguenther@suse.de>

	* cfganal.c (connect_infinite_loops_to_exit): First call
	add_noreturn_fake_exit_edges.
	* ipa-sra.c (process_scan_results): Do not call the now redundant
	add_noreturn_fake_exit_edges.
	* predict.c (tree_estimate_probability): Likewise.
	(rebuild_frequencies): Likewise.
	* store-motion.c (one_store_motion_pass): Likewise.