Remove warnings on new_* constructors (#20026)
Summary:
Stack from [ghstack](https://github.com/ezyang/ghstack):
* **#20026 Remove warnings on new_* constructors**
Revert of #16770, fixes #19995
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20026
Pulled By: driazati
Differential Revision: D15171691
fbshipit-source-id: 057c3b4a9fd6086ca240007e5404a286080f04b6
