tree-ssa-forwprop.c (forward_propagate_into_gimple_cond): Canonicalize negated predicates by swapping edges.

2011-09-07  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-forwprop.c (forward_propagate_into_gimple_cond):
	Canonicalize negated predicates by swapping edges.
	(forward_propagate_into_cond): Likewise.

	* gcc.dg/tree-ssa/forwprop-16.c: New testcase.

From-SVN: r178634