re PR middle-end/45819 (unexpected unaligned access to volatile int)

2011-07-22  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/45819
	* tree-ssa-forwprop.c (forward_propagate_addr_expr_1): Properly
	preserve volatile and notrap flags.

	* gcc.dg/pr45819.c: New testcase.

From-SVN: r176623