re PR tree-optimization/77979 (ICE on valid code at -Os and above on x86_64-linux-gnu: Segmentation fault)

2016-10-14  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/77979
	* tree-vrp.c (compare_name_with_value): Handle released SSA names
	in the equivalency sets.
	(compare_names): Likewise.

	* gcc.dg/torture/pr77979.c: New testcase.

From-SVN: r241162