Regressions on trunk at revision 267163 vs revision 267156

[H.J. Lu (ia32 Core i7)]

New failures:
FAIL: gcc.dg/tree-ssa/builtin-snprintf-4.c scan-tree-dump-times optimized " = snprintf" 12
FAIL: gcc.dg/tree-ssa/builtin-snprintf-4.c scan-tree-dump-times optimized " = vsnprintf" 12
FAIL: gcc.dg/tree-ssa/builtin-snprintf-4.c  (test for warnings, line 106)
FAIL: gcc.dg/tree-ssa/builtin-snprintf-4.c  (test for warnings, line 128)
FAIL: gcc.dg/tree-ssa/builtin-snprintf-4.c  (test for warnings, line 74)
FAIL: gcc.dg/tree-ssa/builtin-snprintf-4.c  (test for warnings, line 87)

New passes: