message: Fixed error message for experimental_get_compiler_ir
diff: @@ -335,7 +335,8 @@ static py::bytes TFE_GetCompilerIr(py::handle& ctx,
  } else {
  ThrowValueError(
  absl::StrFormat("Invalid stage selected: '%s'. Valid values are: "
  - "'hlo', 'optimized_hlo', 'optimized_hlo_dot'",
  + "'hlo', 'hlo_serialized', 'optimized_hlo', "
  + "'optimized_hlo_serialized', 'optimized_hlo_dot'",
  s_stage)
  .c_str());
  }
  