THC: Cleanup dead code (#64441)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/64441
Test Plan: Imported from OSS
Reviewed By: gchanan
Differential Revision: D30735342
Pulled By: ngimel
fbshipit-source-id: 84ab36f7aec6b8cd7f1f34c19a58a382c06ad68d
