Regressions on trunk at revision 157805 vs revision 157799

[H.J. Lu]

New failures:
WARNING: program timed out.

New passes:
FAIL: gcc.dg/cpp/include6.c (test for excess errors)
FAIL: gcc.dg/cpp/include6.c (test for excess errors)
FAIL: gcc.dg/raw-string-1.c (test for excess errors)
FAIL: gcc.dg/raw-string-1.c (test for excess errors)
FAIL: gcc.dg/raw-string-2.c (test for excess errors)
FAIL: gcc.dg/raw-string-2.c (test for excess errors)
FAIL: gcc.dg/raw-string-5.c (test for excess errors)
FAIL: gcc.dg/raw-string-5.c (test for excess errors)
FAIL: gcc.dg/raw-string-6.c  (test for errors, line 4)
FAIL: gcc.dg/raw-string-6.c  (test for errors, line 4)
FAIL: gcc.dg/raw-string-6.c  (test for errors, line 4)
FAIL: gcc.dg/raw-string-6.c  (test for errors, line 4)
FAIL: gcc.dg/raw-string-6.c (test for excess errors)
FAIL: gcc.dg/raw-string-6.c (test for excess errors)
FAIL: gcc.dg/raw-string-7.c (test for excess errors)
FAIL: gcc.dg/raw-string-7.c (test for excess errors)