tree-ssa-sccvn.c (struct vn_walk_cb_data): Add orig_ref member.

tree-ssa-sccvn.c (struct vn_walk_cb_data): Add orig_ref member.

2019-07-09  Richard Biener  <rguenther@suse.de>

	* tree-ssa-sccvn.c (struct vn_walk_cb_data): Add orig_ref member.
	(vn_reference_lookup_3): If the main ref has no access path recorded
	but orig_ref has use it to do access-path based disambiguation.
	(vn_reference_lookup_pieces): Adjust.
	(vn_reference_lookup): Pass down original ref if we valueized.

	* gcc.dg/tree-ssa/alias-access-path-1.c: Scan fre1 dump.
	* gcc.dg/tree-ssa/alias-access-path-2.c: Likewise.
	* gcc.dg/tree-ssa/alias-access-path-8.c: Likewise.

From-SVN: r273294