re PR tree-optimization/70986 (ICE on valid code at -O3 on x86_64-linux-gnu in combine_blocks, at tree-if-conv.c:2219)

2016-05-12  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/70986
	* cfganal.c: Include cfgloop.h.
	(dfs_find_deadend): Prefer to take edges exiting loops.

	* gcc.dg/torture/pr70986-1.c: New testcase.
	* gcc.dg/torture/pr70986-2.c: Likewise.
	* gcc.dg/torture/pr70986-3.c: Likewise.

From-SVN: r236158