Regressions on trunk at revision 218994 vs revision 218988

[H.J. Lu Intel64 Core i7]

New failures:

New passes:
FAIL: ext/profile/mutex_extensions_neg.cc  (test for errors, line 306)
FAIL: ext/profile/mutex_extensions_neg.cc  (test for errors, line 306)
FAIL: ext/profile/mutex_extensions_neg.cc (test for excess errors)