Regressions on trunk at revision 222419 vs revision 222416

[H.J. Lu ia32 Core i7]

New failures:
FAIL: g++.dg/ext/alias-canon2.C  -std=c++11 (test for excess errors)
FAIL: g++.dg/ext/alias-canon2.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/ext/alias-canon2.C  -std=c++98 (test for excess errors)

New passes: