Regressions on trunk at revision 204404 vs revision 204394

[H.J. Lu Intel64 Core 2/i7]

New failures:

New passes:
FAIL: experimental/optional/cons/copy.cc (test for excess errors)
FAIL: experimental/optional/cons/move.cc execution test
FAIL: experimental/optional/cons/value.cc (test for excess errors)
FAIL: experimental/optional/cons/value.cc execution test
FAIL: experimental/optional/constexpr/cons/value.cc (test for excess errors)