2014-12-15  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/64312
	* tree-ssa-sccvn.c (vn_reference_lookup_pieces): Use
	vuse_ssa_val as callback to walk_non_aliased_vuses.
	(vn_reference_lookup): Likewise.

	* g++.dg/torture/pr64312.C: New testcase.

From-SVN: r218756