re PR tree-optimization/71908 (ICE at -Os and above in both 32-bit and 64-bit modes on x86_64-linux-gnu (get_constraint_for_component_ref))

2016-07-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/71908
	* tree-ssa-structalias.c (get_constraint_for_component_ref): Handle
	symbolic constants in a more reliable way.

	* gcc.dg/torture/pr71908.c: New testcase.

From-SVN: r238467