[PATCH] Avoid more irreducible loops in FSM threader

[PATCH] Avoid more irreducible loops in FSM threader

	* tree-ssa-threadupdate.c (valid_jump_thread_path): Also detect
	cases where the loop latch edge is in the middle of an FSM
	path.

	* gcc.dg/tree-ssa/ssa-thread-11.c: Verify that we do not have
	irreducible loops in the CFG.

From-SVN: r229685