re PR tree-optimization/67221 (ICE at -Os and above on x86_64-linux-gnu: Segmentation fault (program cc1))

2015-08-17  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/67221
	* tree-ssa-sccvn.c (visit_phi): Keep all-TOP args TOP.
	(sccvn_dom_walker::before_dom_children): Mark backedges of
	non-executable blocks as not executable.

	* gcc.dg/torture/pr67221.c: New testcase.

From-SVN: r226938