Regressions on trunk at revision 181739 vs revision 181731

[H.J. Lu Intel64 Core 2/i7]

New failures:

New passes:
FAIL: gcc.dg/atomic-load-4.c execution test
FAIL: gcc.dg/simulate-thread/atomic-load-longlong.c  -O0 -g  thread simulation test
FAIL: gcc.dg/simulate-thread/atomic-load-longlong.c  -O1 -g  thread simulation test
FAIL: gcc.dg/simulate-thread/atomic-load-longlong.c  -O2 -g  thread simulation test
FAIL: gcc.dg/simulate-thread/atomic-load-longlong.c  -O3 -g  thread simulation test
FAIL: gcc.dg/simulate-thread/atomic-load-longlong.c  -Os -g  thread simulation test
FAIL: gcc.dg/simulate-thread/atomic-other-longlong.c  -O0 -g  thread simulation test
FAIL: gcc.dg/simulate-thread/atomic-other-longlong.c  -O1 -g  thread simulation test
FAIL: gcc.dg/simulate-thread/atomic-other-longlong.c  -O2 -g  thread simulation test
FAIL: gcc.dg/simulate-thread/atomic-other-longlong.c  -O3 -g  thread simulation test
FAIL: gcc.dg/simulate-thread/atomic-other-longlong.c  -Os -g  thread simulation test