tree-vect-data-refs.c (vect_enhance_data_refs_alignment): When all DRs have unknown misaligned do not always peel when...

2017-05-03  Richard Biener  <rguenther@suse.de>

	* tree-vect-data-refs.c (vect_enhance_data_refs_alignment):
	When all DRs have unknown misaligned do not always peel
	when there is a store but apply the same costing model as if
	there were only loads.

	* gcc.dg/vect/costmodel/x86_64/costmodel-alignpeel.c: New testcase.

From-SVN: r247544