re PR bootstrap/42347 (sched-deps.c:3840:1: internal compiler error: in fixup_reorder_chain, at cfglayout.c:796)

	PR bootstrap/42347
	* cfglayout.c (fixup_reorder_chain): Allow returnjump_p
	to have no fallthru edge.

	* gcc.c-torture/compile/pr42347.c: New test.

From-SVN: r159496