Regressions on trunk at revision 205726 vs revision 205719

[H.J. Lu Intel64]

New failures:
FAIL: 30_threads/async/async.cc execution test

New passes:
FAIL: c-c++-common/tsan/tls_race.c  -O2  output pattern test, is , should match WARNING: ThreadSanitizer: data race.*(
FAIL: g++.dg/warn/pr15774-1.C -std=c++11  (test for errors, line 3)
FAIL: g++.dg/warn/pr15774-1.C -std=c++98  (test for errors, line 3)