Add hash() global (#18258)
Summary:
This adds `hash()` which supports `int`, `str`, and `float`. It relies on `std::hash` which is implementation defined, so the result of `hash()` in TorchScript is not the same as in Python, but should satisfy the same properties.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18258
Differential Revision: D14692317
Pulled By: driazati
fbshipit-source-id: 909df5d024bb3feea157d5a203b7de53c72261c9
