Regressions on trunk at revision 250984 vs revision 250983

[H.J. Lu ia32]

New failures:
FAIL: gcc.dg/compare2.c case 20 (test for warnings, line 49)
FAIL: gcc.dg/compare2.c case 24 (test for warnings, line 57)
FAIL: gcc.dg/compare2.c (test for excess errors)

New passes: