Regressions on trunk at revision 241351 vs revision 241344

[H.J. Lu Intel64 Core i7]

New failures:

New passes:
FAIL: gcc.dg/Walloca-1.c (test for excess errors)
FAIL: gcc.dg/Walloca-1.c  (test for warnings, line 26)
FAIL: gcc.dg/Walloca-2.c note (test for warnings, line 34)
FAIL: gcc.dg/Walloca-2.c (test for excess errors)
FAIL: gcc.dg/Walloca-2.c  (test for warnings, line 34)