tree-ssa-operands.c (add_virtual_operand): Only mark stores as has_volatile_ops if alias information is not available.

2007-09-04  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-operands.c (add_virtual_operand): Only mark
	stores as has_volatile_ops if alias information is not available.

From-SVN: r128089