message: [TF/XLA] Remove an accidentally introduced race condition
  cl/288939060 has introduced a race condition: previously, the lambda was only run once. This is the intend of the code.
  Thanks to hyeontaek@ for discovering the bug.
diff: @@ -140,7 +140,7 @@ XlaOpRegistry::~XlaOpRegistry() = default;
  // Lazily register the CPU and GPU JIT devices the first time
  // GetCompilationDevice is called.
  - {
  + static void* registration_init = [&registry]() {
  MarkForCompilationPassFlags* flags = GetMarkForCompilationPassFlags();
  bool cpu_global_jit = flags->tf_xla_cpu_global_jit;
  VLOG(2) << "tf_xla_cpu_global_jit = " << cpu_global_jit;
  @@ -162,7 +162,9 @@ XlaOpRegistry::~XlaOpRegistry() = default;
  registration.autoclustering_policy =
  XlaOpRegistry::AutoclusteringPolicy::kIfEnabledGlobally;
  }
  - }
  + return nullptr;
  + }();
  + (void)registration_init;
  mutex_lock lock(registry.mutex_);
  auto it = registry.compilation_devices_.find(device_name);
  