* tree-vectorizer.h (struct dr_with_seg_len): Remove class
	member OFFSET.
	* tree-vect-data-refs.c (operator ==): Handle DR_OFFSET directly,
	rather than OFFSET.
	(comp_dr_with_seg_len_pair): Ditto.
	(vect_prune_runtime_alias_test_list): Ditto.  Also Canonicalize
	struct dr_with_seg_len_pair against DR_OFFSET.
	* tree-vect-loop-manip.c (vect_create_cond_for_alias_checks): Handle
	DR_OFFSET directly.

	* gcc.dg/vect/vect-alias-check-1.c: New test.

From-SVN: r237549