cfgrtl.c (commit_edge_insertions): Call find_many_sub_basic_block only when some code has been emitted.

	* cfgrtl.c (commit_edge_insertions):  Call
	find_many_sub_basic_block only when some code has been emitted.
	(commit_edge_insertions_watch_calls): Bring into sync with
	commit_edge_insertions

From-SVN: r63248