Regressions on trunk at revision 259336 vs revision 259316

[H.J. Lu Intel64 -fpic -mcmodel=medium -mcmodel=large]

New failures:

New passes:
FAIL: g++.dg/warn/Wzero-as-null-pointer-constant-7.C  -std=gnu++98 (test for excess errors)
FAIL: g++.dg/warn/Wzero-as-null-pointer-constant-7.C  -std=gnu++98 (test for excess errors)
FAIL: g++.dg/warn/Wzero-as-null-pointer-constant-7.C  -std=gnu++98 (test for excess errors)