message: [tf.data] Add trace for IteratorGetNextAsOptionalOp::DoCompute
diff: @@ -925,6 +925,13 @@ Status IteratorGetNextOp::DoCompute(OpKernelContext* ctx) {
  }
  Status IteratorGetNextAsOptionalOp::DoCompute(OpKernelContext* ctx) {
  + profiler::TraceMe traceme(
  + [&] {
  + return strings::StrCat(
  + "IteratorGetNextAsOptionalOp::DoCompute#id=", ctx->step_id(),
  + ",iter_num=", ctx->frame_iter().iter_id, "#");
  + },
  + profiler::kInfo);
  tensorflow::ResourceTagger tag(kTFDataResourceTag,
  ctx->op_kernel().type_string());
  IteratorResource* iterator;
  