faithful signature support in BoxedKernelWrapper (#47267)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/47267
Test Plan: Imported from OSS
Reviewed By: ezyang
Differential Revision: D24701488
Pulled By: bhosmer
fbshipit-source-id: dbce246319670f9590c5762ad20c26cb24575fe8
