message: Remove a redundant funcationalize pass.
  The pass is already called in "ConvertGraphToMlir".
diff: @@ -1766,12 +1766,6 @@ StatusOr<mlir::OwningModuleRef> ConvertGraphdefToMlir(
  }
  TF_RETURN_IF_ERROR(ConvertGraphDefToGraph(
  options, std::move(preprocessed_graphdef), &graph));
  - if (specs.upgrade_legacy) {
  - // TODO(jpienaar): Avoid need for const_cast.
  - TF_RETURN_IF_ERROR(UpgradeLegacyGraph(
  - &graph, const_cast<FunctionLibraryDefinition*>(&graph.flib_def())));
  - }
  -
  return ConvertGraphToMlir(graph, debug_info, graph.flib_def(), specs,
  context);
  }
  