Regressions on trunk at revision 209818 vs revision 209800

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gcc.dg/pr18079-2.c (test for excess errors)
FAIL: gcc.dg/pr18079-2.c  (test for warnings, line 13)
FAIL: gcc.dg/pr18079-2.c  (test for warnings, line 16)
FAIL: gcc.dg/pr18079-2.c  (test for warnings, line 6)
FAIL: gcc.dg/pr18079-2.c  (test for warnings, line 9)