Regressions on trunk at revision 256835 vs revision 256779

[H.J. Lu x32]

New failures:

New passes:
FAIL: g++.dg/template/nontype10.C  -std=c++11 (test for excess errors)
FAIL: g++.dg/template/nontype10.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/template/nontype10.C  -std=c++98 (test for excess errors)