remove a few unused THCTensor/Storage methods (#66555)
Summary:
Per title
Pull Request resolved: https://github.com/pytorch/pytorch/pull/66555
Reviewed By: mruberry
Differential Revision: D31620969
Pulled By: ngimel
fbshipit-source-id: 1922ef523df473e8673a35c4a155b7b0cf000953
