PR tree-optimization/89280

	PR tree-optimization/89280
	* tree-cfgcleanup.c (maybe_dead_abnormal_edge_p,
	builtin_setjmp_setup_bb): New functions.
	(cleanup_control_flow_pre): Ignore maybe_dead_abnormal_edge_p edges.
	When visiting __builtin_setjmp_setup block, queue in special
	setjmp_vec vector edges from .ABNORMAL_DISPATCHER to corresponding
	__builtin_setjmp_receiver.  Remove .ABNORMAL_DISPATCHER basic blocks
	from visited after the loop if they don't have any visited successor
	blocks.

	* gcc.c-torture/compile/pr89280.c: New test.
	* gcc.dg/torture/pr57147-2.c: Don't expect a setjmp after noreturn
	function.  Skip the test for -O0.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@269243 138bc75d-0d04-0410-961f-82ee72b054a4