tree-ssa-loop-ivopts.c (may_be_unaligned_p): Check the alignment of the variable part of the offset as well.

	* tree-ssa-loop-ivopts.c (may_be_unaligned_p): Check the alignment of
	the variable part of the offset as well.  Use highest_pow2_factor for
	all alignment checks.

From-SVN: r158948