2019-02-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/89296
	* tree-ssa-loop-ch.c (ch_base::copy_headers): Restrict setting
	of no-warning flag to cases that might emit the bogus warning.

	* gcc.dg/uninit-pr89296.c: New testcase.

From-SVN: r268986