Refactored ForeachFunctors.cuh (#46660)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/46660
Test Plan: Imported from OSS
Reviewed By: cpuhrsch
Differential Revision: D24453345
Pulled By: izdeby
fbshipit-source-id: 307839d40a358d9dda3eee6f62990b38b8274642
