message: Special-cased a single thread in parallel dynamic stitch (ParallelDynamicStitch
  op).
diff: @@ -285,7 +285,8 @@ class DynamicStitchOpImplCPU : public DynamicStitchOpImplBase<T> {
  }
  }
  };
  - if (Parallel) {
  + if (Parallel &&
  + c->device()->tensorflow_cpu_worker_threads()->num_threads > 1) {
  auto thread_pool =
  c->device()->tensorflow_cpu_worker_threads()->workers;
  size_t total_indices_size = 0;
  