message: Correctly incref items put into the tuple to keep msan happy.
diff: @@ -1091,8 +1091,9 @@ bool MaybeRunRecordGradientCallback(const tensorflow::OpDef* op_def,
  PyObject* inputs = PyTuple_New(op_def->input_arg_size());
  for (int i = 0; i < op_def->input_arg_size(); i++) {
  - PyTuple_SET_ITEM(
  - inputs, i, PyTuple_GET_ITEM(args, kFastPathExecuteInputStartIndex + i));
  + auto* input = PyTuple_GET_ITEM(args, kFastPathExecuteInputStartIndex + i);
  + Py_INCREF(input);
  + PyTuple_SET_ITEM(inputs, i, input);
  }
  int args_size = PyTuple_GET_SIZE(args);
  @@ -1100,9 +1101,10 @@ bool MaybeRunRecordGradientCallback(const tensorflow::OpDef* op_def,
  args_size - op_def->input_arg_size() - kFastPathExecuteInputStartIndex;
  PyObject* attrs = PyTuple_New(num_attrs);
  for (int i = 0; i < num_attrs; i++) {
  - PyTuple_SET_ITEM(attrs, i,
  - PyTuple_GET_ITEM(args, kFastPathExecuteInputStartIndex +
  - op_def->input_arg_size() + i));
  + auto* attr = PyTuple_GET_ITEM(
  + args, kFastPathExecuteInputStartIndex + op_def->input_arg_size() + i);
  + Py_INCREF(attr);
  + PyTuple_SET_ITEM(attrs, i, attr);
  }
  PyObject* callback_args = Py_BuildValue("OOO", inputs, attrs, result);
  