re PR target/19340 (Compilation SEGFAULTs with -O1 -fschedule-insns2 -fsched2-use-traces on an x86 architecture.)

	PR target/19340
	* reg-stack.c (reg_to_stack): Update register liveness also
	for flag_sched2_use_traces.

testsuite/

	PR target/19340
	* gcc.dg/pr19340.c: New test.

From-SVN: r106632