Regressions on trunk at revision 148455 vs revision 148431

[H.J. Lu ia32]

New failures:
FAIL: gcc.dg/Wshadow-3.c  (test for warnings, line 47)
FAIL: gcc.dg/Wshadow-3.c (test for excess errors)
FAIL: gcc.dg/func-ptr-conv-1.c (test for excess errors)
FAIL: gcc.dg/func-ptr-conv-1.c bad conversion (test for warnings, line 40)
FAIL: gcc.dg/func-ptr-conv-1.c bad conversion (test for warnings, line 41)
FAIL: gcc.dg/pr36902.c  (test for warnings, line 47)
FAIL: gcc.dg/pr36902.c (test for excess errors)

New passes: