Regressions on trunk at revision 166601 vs revision 166585

[H.J. Lu Intel64]

New failures:

New passes:
FAIL: g++.dg/ext/bitfield2.C  (test for warnings, line 6)
FAIL: g++.dg/ext/bitfield2.C (test for excess errors)
FAIL: g++.dg/ext/bitfield4.C  (test for warnings, line 5)
FAIL: g++.dg/ext/bitfield4.C (test for excess errors)
FAIL: gcc.dg/bitfld-15.c  (test for warnings, line 11)
FAIL: gcc.dg/bitfld-15.c (test for excess errors)
FAIL: gcc.dg/bitfld-17.c  (test for warnings, line 10)
FAIL: gcc.dg/bitfld-17.c (test for excess errors)