OptimizerOptions opts;
  auto pflr = std::make_unique<ProcessFunctionLibraryRuntime>(
      nullptr, env, /*config=*/nullptr, TF_GRAPH_DEF_VERSION, flib_def, opts);
  FunctionLibraryRuntime* lib_runtime =
      pflr->GetFLR(ProcessFunctionLibraryRuntime::kDefaultFLRDevice);
  TF_RETURN_IF_ERROR(BackwardsConstAnalysis(*graph, nullptr,
                                            &compile_time_const_nodes,

    return std::make_unique<RecursiveCompilabilityChecker>(op_filter_,
                                                            device_type_);
  }

  FunctionLibraryRuntime* GetFunctionLibraryRuntime() {
    OptimizerOptions opts;
    pflr_ = std::make_unique<ProcessFunctionLibraryRuntime>(
        nullptr, Env::Default(), /*config=*/nullptr, TF_GRAPH_DEF_VERSION,

  std::unique_ptr<Graph> graph_out;
  FunctionLibraryDefinition* const library = options.flib_def;

  // Constant folding below might need to run part of the function to compute
  // constants. Create an FunctionLibraryRuntime with a single CPU device
  // that can run the part of the function.
  // NOTE: If this turns out to be slow, we can cache the FLRs keyed by
  // `options`.
  SessionOptions session_options;

  s = ConvertGraphDefToGraph(options, *graphdef, graph.get());
  if (!s.ok()) return s;

  s = PerformStaticShapeInferenceBeforeEncapsulation(graph.get());
  if (!s.ok()) return s;

  // Create FunctionLibraryRuntime.
  SessionOptions session_options;
  std::vector<std::unique_ptr<Device>> devices;
  TF_CHECK_OK(DeviceFactory::AddDevices(
      session_options, "/job:localhost/replica:0/task:0", &devices));

  std::unique_ptr<ProcessFunctionLibraryRuntime> pflr(
      new ProcessFunctionLibraryRuntime(nullptr, env_, /*config=*/nullptr,
                                        TF_GRAPH_DEF_VERSION, flib_def_, opts));
  FunctionLibraryRuntime* lib_runtime =
      pflr->GetFLR(ProcessFunctionLibraryRuntime::kDefaultFLRDevice);
  std::vector<bool> compile_time_const_nodes(graph_->num_node_ids(), false);
  TF_RETURN_IF_ERROR(BackwardsConstAnalysis(