2012-09-04  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/54458
	* tree-ssa-threadupdate.c (thread_through_loop_header): If we
	turn the loop into one with multiple latches mark it so.

	* gcc.dg/torture/pr54458.c: New testcase.

From-SVN: r190918