re PR tree-optimization/50389 (ICE: in execute_todo, at passes.c:1730 with -O -freorder-blocks -ftracer and __builtin___memcpy_chk())

2011-10-10  Richard Guenther  <rguenther@suse.de>

	PR middle-end/50389
	* gimple-fold.c (gimplify_and_update_call_from_tree): Do not
	mark symbols for renaming.  Append the VUSE to all statements
	that possibly can have one.

	* gcc.dg/torture/pr50389.c: New testcase.

From-SVN: r179757