Regressions on trunk at revision 222431 vs revision 222419

[H.J. Lu ia32]

New failures:

New passes:
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)