Regressions on trunk at revision 217754 vs revision 217750

[H.J. Lu ia32 Core i7]

New failures:

New passes:
FAIL: gcc.dg/pure-2.c detect pure candidate (test for warnings, line 16)
FAIL: gcc.dg/pure-2.c detect pure candidate (test for warnings, line 54)
FAIL: gcc.dg/pure-2.c detect pure candidate (test for warnings, line 9)
FAIL: gcc.dg/pure-2.c (test for excess errors)