PR middle-end/71476
	* gimplify.c (maybe_warn_switch_unreachable): Factored out of
	gimplify_switch_expr.
	(warn_switch_unreachable_r): New function.

	* c-c++-common/Wswitch-unreachable-4.c: New test.
	* gcc.dg/Wswitch-unreachable-2.c: New test.
	* g++.dg/tm/jump1.C: Move dg-warning.

From-SVN: r237367