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Fix op_t_copy

Summary:
Zero dimension input should be supported.

```
>>> torch.ones([]).t()
tensor(1.)
```

Reviewed By: manuelcandales

Differential Revision: D48191970

fbshipit-source-id: 4916b224ad2a432cbb0af97dc42eebc8248b6a38
H
Hansong Zhang committed
c81360568ec1ceef2e09eb1c6ebe08d411b80e19
Parent: e346b82
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 8/10/2023, 8:39:03 PM