Regressions on trunk at revision 167637 vs revision 167624

[H.J. Lu Intel64]

New failures:

New passes:
FAIL: 20_util/auto_ptr/assign_neg.cc  (test for errors, line 134)
FAIL: 20_util/auto_ptr/assign_neg.cc (test for excess errors)
FAIL: 20_util/unique_ptr/assign/assign_neg.cc (test for excess errors)
FAIL: 20_util/weak_ptr/comparison/cmp_neg.cc (test for excess errors)