Regressions on trunk at revision 257824 vs revision 257778

[H.J. Lu ia32]

New failures:

New passes:
FAIL: g++.dg/template/overload15.C  -std=c++11 (test for excess errors)
FAIL: g++.dg/template/overload15.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/template/overload15.C  -std=c++98 (test for excess errors)