re PR middle-end/87610 (wrong-code with restrict)

re PR middle-end/87610 (wrong-code with restrict)

2018-10-15  Richard Biener  <rguenther@suse.de>

	PR middle-end/87610
	* tree-ssa-structalias.c (struct vls_data): Add escaped_p member.
	(visit_loadstore): When a used restrict tag escaped verify that
	the points-to solution of "other" pointers do not include
	escaped.
	(compute_dependence_clique): If a used restrict tag escaped
	communicated that down to visit_loadstore.

	* gcc.dg/torture/restrict-6.c: New testcase.

From-SVN: r265160