Add NativeFunctionGroup (#45918)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45918
This groups together related native functions (functional, inplace, out)
into a single group. It's not used by anything but Jiakai said this
would be useful for his stuff so I'm putting it in immediately.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: smessmer
Differential Revision: D24163526
Pulled By: ezyang
fbshipit-source-id: 9979b0fe9249c78e4a64a50c5ed0e2ab99f499b9
