PR tree-optimization/53729
	PR tree-optimization/53636
	* tree-vect-slp.c (vect_slp_analyze_bb_1): Delay call to
	vect_verify_datarefs_alignment until after statements have
	been marked as relevant/irrelevant.
	* tree-vect-data-refs.c (vect_verify_datarefs_alignment):
	Skip irrelevant statements.
	(vect_enhance_data_refs_alignment): Use STMT_VINFO_RELEVANT_P
	instead of STMT_VINFO_RELEVANT.
	(vect_get_data_access_cost): Do not check for supportable
	alignment before calling vect_get_load_cost/vect_get_store_cost.
	* tree-vect-stmts.c (vect_get_store_cost): Do not abort when
	handling unsupported alignment.
	(vect_get_load_cost): Likewise.

From-SVN: r188979