Regressions on trunk at revision 217705 vs revision 217689

[i32coreavxi@ecsmtp.ims.intel.com]

New failures:
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)

New passes: