Regressions on trunk at revision 149726 vs revision 149721

[H.J. Lu ia32]

New failures:

New passes:
FAIL: gcc.dg/Wshadow-3.c  (test for warnings, line 47)
FAIL: gcc.dg/Wshadow-3.c (test for excess errors)
FAIL: gcc.dg/pr36902.c  (test for warnings, line 47)
FAIL: gcc.dg/pr36902.c (test for excess errors)