message: Change OpNameToAttrTypeMap from std::unordered_map<string, const AttrTypeMap*> to tensorflow::gtl::FlatMap<string, const AttrTypeMap*>
diff: @@ -32,8 +32,9 @@ namespace {
  mutex g_op_name_to_attr_type_map_lock(LINKER_INITIALIZED);
  -std::unordered_map<string, const AttrTypeMap*>* OpNameToAttrTypeMap() {
  - static auto* const m = new std::unordered_map<string, const AttrTypeMap*>;
  +tensorflow::gtl::FlatMap<string, const AttrTypeMap*>* OpNameToAttrTypeMap() {
  + static auto* const m =
  + new tensorflow::gtl::FlatMap<string, const AttrTypeMap*>;
  return m;
  }
  