Add %= support in TorchScript (#38983)
Summary:
Fix https://github.com/pytorch/pytorch/issues/38336
Add %= support in TorchScript. It's now possible to do something like:
```py
torch.jit.script
def mm(a,b):
a %= b
return a
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38983
Differential Revision: D21803523
Pulled By: SplitInfinity
fbshipit-source-id: 3437860d06d32e26ca9a5497099148c1f1616c5b
