* tree.c (tree_ctz): New function.
	* tree.h (tree_ctz): New prototype.
	* tree-ssanames.h (get_range_info, get_nonzero_bits): Change
	first argument from tree to const_tree.
	* tree-ssanames.c (get_range_info, get_nonzero_bits): Likewise.
	* tree-vectorizer.h (vect_generate_tmps_on_preheader): New prototype.
	* tree-vect-loop-manip.c (vect_generate_tmps_on_preheader): No longer
	static.
	* expr.c (highest_pow2_factor): Reimplemented using tree_ctz.
	* tree-vect-loop.c (vect_analyze_loop_operations,
	vect_transform_loop): Don't force scalar loop for bound just because
	number of iterations is unknown, only do it if it is not known to be
	a multiple of vectorization_factor.
	* builtins.c (get_object_alignment_2): Use tree_ctz on offset.

From-SVN: r204257