re PR tree-optimization/71802 (gcc ICE at -O3 on valid code on x86_64-linux-gnu in expand_LOOP_VECTORIZED)

2016-08-09  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/71802
	* tree-cfgcleanup.c (cleanup_tree_cfg_bb): Make sure to catch
	all merge opportunities with the predecessor.

	* gcc.dg/torture/pr71802.c: New testcase.

From-SVN: r239274