Migrate clamp and clamp_ from the TH to Aten (CPU) (#25290)
Summary:
https://github.com/pytorch/pytorch/issues/24686
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25290
Differential Revision: D17122999
Pulled By: ifedan
fbshipit-source-id: d6aec62ded0f01618f8b8c0d8057207df3fd329b
