Add named_guard to native_functions options (#21373)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21373
ghimport-source-id: acab6d3ab0b287d504afa98eaefa2aed6fe99453
Differential Revision: D15717925
Pulled By: zou3519
fbshipit-source-id: 8515c448b368be79f71681833b5edf960da44fe8
