tree-ssa-dom.c (record_equivalences_from_incoming_edge): Only look at case labels if the immediate dominator is also the only predecessor.

	* tree-ssa-dom.c (record_equivalences_from_incoming_edge):
	Only look at case labels if the immediate dominator is also
	the only predecessor.  Don't look for more case labels if the
	first seen is a case range.

From-SVN: r82480