Construct CppSignatureGroup from NativeFunction (#49245)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/49245
This will make it easier to implement the POC in
https://github.com/peterbell10/pytorch/commit/d534f7d4c555a37fd178c143098b8537a5a05d61
see also https://github.com/pytorch/pytorch/pull/45666
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Reviewed By: smessmer
Differential Revision: D25594005
Pulled By: ezyang
fbshipit-source-id: e458d3dc3a765ec77425761b9b17f23769cecf9e
