tree-ssa-dom.c (record_equivalences_from_incoming_edge): Record addititional equivalences for equality comparisons between an SSA_NAME...

	* tree-ssa-dom.c (record_equivalences_from_incoming_edge): Record
	addititional equivalences for equality comparisons between an SSA_NAME
	and a constant where the SSA_NAME was set from a widening conversion.

	* g++.dg/tree-ssa/ssa-dom.C: New test.

From-SVN: r196855