Remove `THTensor_(fill)` & `THTensor_(zero)` (#39727)
Summary:
Remove `THTensor_(fill)` & `THTensor_(zero)` following the PR https://github.com/pytorch/pytorch/pull/39042 as reference
Pull Request resolved: https://github.com/pytorch/pytorch/pull/39727
Differential Revision: D21980423
Pulled By: ngimel
fbshipit-source-id: bfeeaebe93d9ff465c7ad21c872cad8f8399537d
