2016-01-10  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/79034
	* tree-call-cdce.c (shrink_wrap_one_built_in_call_with_conds):
	Propagate out degenerate PHIs in the joiner.

	* g++.dg/torture/pr79034.C: New testcase.

From-SVN: r244274