2015-07-08  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/66794
	* passes.c (execute_function_todo): Assert that post-dominators
	are not computed.
	* gimple-ssa-isolate-paths.c (gimple_ssa_isolate_erroneous_paths):
	Free post-dominators.

	* gcc.dg/torture/pr66794.c: New testcase.

From-SVN: r225545