[serializer] small fixes for blink snapshot.

tools/external-reference-check.py

-#!/usr/bin/env python
-# Copyright 2014 the V8 project authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import re
-import os
-import sys
-
-DECLARE_FILE = "src/assembler.h"
-REGISTER_FILE = "src/external-reference-table.cc"
-DECLARE_RE = re.compile("\s*static ExternalReference ([^(]+)\(")
-REGISTER_RE = re.compile("\s*Add\(ExternalReference::([^(]+)\(")
-
-WORKSPACE = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), ".."))
-
-# Ignore those.
-BLACKLISTED = [
-  "fixed_typed_array_base_data_offset",
-  "page_flags",
-  "math_exp_constants",
-  "math_exp_log_table",
-  "ForDeoptEntry",
-]
-
-def Find(filename, re):
-  references = []
-  with open(filename, "r") as f:
-    for line in f:
-      match = re.match(line)
-      if match:
-        references.append(match.group(1))
-  return references
-
-def Main():
-  declarations = Find(DECLARE_FILE, DECLARE_RE)
-  registrations = Find(REGISTER_FILE, REGISTER_RE)
-  difference = list(set(declarations) - set(registrations) - set(BLACKLISTED))
-  for reference in difference:
-    print("Declared but not registered: ExternalReference::%s" % reference)
-  return len(difference) > 0
-
-if __name__ == "__main__":
-  sys.exit(Main())