message: Annotate lambda as requiring lock.
  This fixes errors visible with stricter clang checks
diff: @@ -57,7 +57,9 @@ class LookupTableOp : public OpKernel {
  use_node_name_sharing_));
  }
  - auto creator = [ctx, this](lookup::LookupInterface** ret) {
  + auto creator =
  + [ctx, this](lookup::LookupInterface** ret)
  + EXCLUSIVE_LOCKS_REQUIRED(mu_) {
  lookup::LookupInterface* container = new Container(ctx, this);
  if (!ctx->status().ok()) {
  container->Unref();
  