add function name to error messages generated by checked_tensor_unwrap (#24187)
Summary:
Improve error messages by showing the relevant function call that failed.
Before:
```
>>> torch.ones(1, dtype=torch.float) < torch.ones(1, dtype=torch.double)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
RuntimeError: Expected object of scalar type Float but got scalar type Double for argument https://github.com/pytorch/pytorch/issues/2 'other'
```
After:
```
>>> torch.ones(1, dtype=torch.float) < torch.ones(1, dtype=torch.double)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
RuntimeError: Expected object of scalar type Float but got scalar type Double for argument https://github.com/pytorch/pytorch/issues/2 'other' in call to _th_lt
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/24187
Differential Revision: D16769167
Pulled By: nairbv
fbshipit-source-id: 4992eb4e86bdac2ab8805cc5356f7f92c63e1255
