Move RootIndexMap out of serializer file.

BUILD.gn

 # Copyright 2014 The Chromium 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("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/mips.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 # Because standalone V8 builds are not supported, assume this is part of a
@@ skipping 610 matching lines @@
     "include/v8-debug.h",
     "include/v8-platform.h",
     "include/v8-profiler.h",
     "include/v8-testing.h",
     "include/v8-util.h",
     "include/v8-version.h",
     "include/v8.h",
     "include/v8config.h",
     "src/accessors.cc",
     "src/accessors.h",
+    "src/address-map.cc",
+    "src/address-map.h",
     "src/allocation.cc",
     "src/allocation.h",
     "src/allocation-site-scopes.cc",
     "src/allocation-site-scopes.h",
     "src/api.cc",
     "src/api.h",
     "src/api-natives.cc",
     "src/api-natives.h",
     "src/arguments.cc",
     "src/arguments.h",
@@ skipping 1194 matching lines @@
     if (!is_component_build) {
       sources += [
         "$target_gen_dir/d8-js.cc",
       ]
     }
     if (v8_enable_i18n_support) {
       deps += [ "//third_party/icu" ]
     }
   }
 }