re PR rtl-optimization/71916 (ICE at -O3 on valid code on x86_64-linux-gnu in "maybe_record_trace_start")

	PR rtl-optimization/71916
	* cfgrtl.c (contains_no_active_insn_p): Return false also for
	bb which have a single succ fake edge.

	* gcc.c-torture/compile/pr71916.c: New test.

From-SVN: r238490