re PR tree-optimization/29680 (Misscompilation of spec2006 gcc)

	PR tree-optimization/29680
	* tree-ssa-operands.c (access_can_touch_variable): Revert fix for
	PR 14784.

	* gcc.dg/alias-11.c: New test.


Co-Authored-By: Zdenek Dvorak <dvorakz@suse.cz>

From-SVN: r118754