tree-ssa-loop-manip.c (find_uses_to_rename): Do not scan the whole function when there is nothing to do.

2013-03-18  Richard Biener  <rguenther@suse.de>

	* tree-ssa-loop-manip.c (find_uses_to_rename): Do not scan the
	whole function when there is nothing to do.
	* tree-ssa-loop.c (pass_vectorize): Remove TODO_update_ssa.
	* tree-vectorizer.c (vectorize_loops): Update virtual and
	loop-closed SSA once.
	* tree-vect-loop.c (vect_transform_loop): Do not update SSA here.

From-SVN: r196770