* tree-vect-data-refs.c (vect_setup_realignment): Support realignment

	* tree-vect-data-refs.c (vect_setup_realignment): Support realignment
	in basic blocks.
	(vect_supportable_dr_alignment): Check alignment for basic blocks.
	* tree-vect-slp.c (vect_build_slp_tree): Allow different codes for
	data references.
	(vect_bb_vectorization_profitable_p): New function.
	(vect_slp_analyze_bb): Call vect_bb_vectorization_profitable_p() to
	check if it's worthwhile to vectorize the basic block.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@163260 138bc75d-0d04-0410-961f-82ee72b054a4