Regressions on trunk at revision 174772 vs revision 174765

[H.J. Lu ia32]

New failures:
FAIL: 20_util/is_copy_assignable/value.cc (test for excess errors)
FAIL: 20_util/is_move_assignable/value.cc (test for excess errors)
FAIL: 20_util/is_nothrow_copy_assignable/value.cc (test for excess errors)
FAIL: 23_containers/list/requirements/exception/propagation_consistent.cc (test for excess errors)
FAIL: 23_containers/map/modifiers/insert/2.cc (test for excess errors)
FAIL: 23_containers/map/modifiers/insert/3.cc (test for excess errors)
FAIL: 23_containers/multimap/modifiers/insert/3.cc (test for excess errors)
FAIL: 23_containers/multimap/modifiers/insert/4.cc (test for excess errors)
FAIL: 23_containers/unordered_map/requirements/exception/propagation_consistent.cc (test for excess errors)

New passes: