* tree-ssa-forwprop.c (simplify_conversion_from_bitmask): New function.
	(ssa_forward_propagate_and_combine): Use it.

	* gcc.dg/tree-ssa/forwprop-26.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@198121 138bc75d-0d04-0410-961f-82ee72b054a4