Regressions on trunk at revision 271761 vs revision 271733

[H.J. Lu (Intel64)]

New failures:
FAIL: g++.dg/cpp0x/pr90598.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/cpp0x/pr90598.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/cpp0x/pr90598.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/cpp0x/pr90598.C  -std=c++17 (test for excess errors)

New passes: