Add support, test for kwargs in jit._fork (#38357) (#38665)
Summary:
Closing 38357
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38665
Reviewed By: suo
Differential Revision: D21643697
Pulled By: wconstab
fbshipit-source-id: c292c037f87bc2bb69a4ca163d7107d5396c53a2
