Regressions on trunk at revision 194415 vs revision 194408

[H.J. Lu ia32 Core 2/i7]

New failures:

New passes:
FAIL: g++.dg/asan/asan_test.C  -O2  AddressSanitizer_PthreadExitTest execution test
FAIL: g++.dg/asan/asan_test.C  -O2  AddressSanitizer_SignalTest *c = 0 output pattern test, should match AddressSanitizer: SEGV on unknown address
FAIL: g++.dg/asan/asan_test.C  -O2  AddressSanitizer_SignalTest *c = 0 output pattern test, should match AddressSanitizer: SEGV on unknown address
FAIL: g++.dg/asan/asan_test.C  -O2  AddressSanitizer_ThreadStackReuseTest execution test
FAIL: g++.dg/asan/asan_test.C  -O2  AddressSanitizer_ThreadedTest ThreadedTestSpawn() output pattern test, should match Thread T.*created.*Thread T.*created.*Thread T.*created