2016-09-29  Richard Biener  <rguenther@suse.de>

	* tree-vrp.c (set_defs_to_varying): New helper avoiding
	writing to vr_const_varying.
	(vrp_initialize): Call it.
	(vrp_visit_stmt): Likewise.
	(evrp_dom_walker::before_dom_children): Likewise.

From-SVN: r240612