options, result, client_->default_device_ordinal());
  TF_ASSIGN_OR_RETURN(
      std::vector<std::unique_ptr<xla::AotCompilationResult>> aot_results,
      client_->CompileAheadOfTime(*result.computation, argument_layouts,
                                  build_options));
  TF_RET_CHECK(aot_results.size() == 1);
  return aot_results[0]->SerializeAsString();
}

  xla::Shape result_shape(pshape->result());
  instance.result_layout = &result_shape;
  absl::StatusOr<std::vector<std::unique_ptr<xla::AotCompilationResult>>>
      aot_or = client->CompileAheadOfTime({instance}, aot_opts);
  if (!aot_or.ok()) {
    return errors::Unknown("XLA compilation failed: ",
                           aot_or.status().message());
  }
  compile_result->aot =