Regressions on trunk at revision 174833 vs revision 174804

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

New failures:

New passes:
FAIL: 20_util/is_nothrow_copy_assignable/value.cc (test for excess errors)
FAIL: 20_util/unique_ptr/cons/pointer_array.cc (test for excess errors)
FAIL: 23_containers/map/modifiers/insert/3.cc (test for excess errors)
FAIL: 23_containers/multimap/modifiers/insert/1.cc (test for excess errors)
FAIL: 23_containers/multiset/requirements/exception/generation_prohibited.cc (test for excess errors)