clean up unused reduction functions in THC (#56293)
Summary:
Per title
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56293
Reviewed By: mruberry
Differential Revision: D27833949
Pulled By: ngimel
fbshipit-source-id: b9bf03c783b41c35890249902ea9bf1c34c9c13d
Author
Natalia Gimelshein
