message: [Executor] Avoid unnecessary heap allocation in PropagateOutputs().
diff: @@ -2159,7 +2159,7 @@ Status ExecutorState::ProcessOutputs(const NodeItem& item, OpKernelContext* ctx,
  void ExecutorState::PropagateOutputs(const TaggedNode& tagged_node,
  const NodeItem* item, EntryVector* outputs,
  TaggedNodeSeq* ready) {
  - auto activity_handle = absl::make_unique<profiler::TraceMe>(
  + profiler::TraceMe activity(
  [&]() {
  return strings::StrCat(
  "ExecutorPropagateOutputs:", item->kernel->name_view(),
  