Regressions on trunk at revision 174810 vs revision 174806

[Kirill Yukhin [ia32 Core i7 AVX]]

New failures:

New passes:
FAIL: 20_util/unique_ptr/assign/assign_neg.cc  (test for errors, line 42)
FAIL: 20_util/unique_ptr/assign/assign_neg.cc  (test for errors, line 48)
FAIL: 20_util/unique_ptr/assign/assign_neg.cc  (test for errors, line 50)
FAIL: 20_util/unique_ptr/assign/assign_neg.cc (test for excess errors)
FAIL: 20_util/unique_ptr/assign/assign_neg.cc candidate-note (test for errors, line 48)
FAIL: 23_containers/vector/requirements/exception/basic.cc (test for excess errors)
FAIL: 23_containers/vector/requirements/exception/generation_prohibited.cc (test for excess errors)
FAIL: 23_containers/vector/requirements/exception/propagation_consistent.cc (test for excess errors)