backport: re PR tree-optimization/51466 (ICE in gimple_rhs_has_side_effects,)

backport: re PR tree-optimization/51466 (ICE in gimple_rhs_has_side_effects,)

	Backport from mainline
	2011-12-08  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/51466
	* tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Also copy
	TREE_SIDE_EFFECTS.

	* gcc.c-torture/execute/pr51466.c: New test.

	2011-11-28  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/50078
	* tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Copy over
	TREE_THIS_VOLATILE also from the old to new lhs resp. rhs.

	* gcc.dg/pr50078.c: New test.

From-SVN: r182157