[Static Runtime] Enforce proper output dtype for many ops (re-land) (#62267)
Summary:
Re-land of D29935444
We previously had lots of ops with implementations like this:
```
if (p_node->Output(0).isNone()) {
p_node->Output(0) = create_empty_like(input_0);
}
...
auto& out = p_node->Output(0);
some_func_out(inputs, out);
```
This would make the output have the correct shape. But it would
also take the dtype of `input_0`, which is not always correct.
This change transforms these blocks to:
```
if (p_node->Output(0).isNone()) {
p_node->Output(0) = some_func(inputs)
} else {
...
auto& out = p_node->Output(0);
some_func_out(inputs, out);
}
```
This gives the output the correct shape and dtype.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62267
Reviewed By: ejguan
Differential Revision: D29937253
Pulled By: malfet
fbshipit-source-id: d91ca5d5703490d7d349a1de2ad3bb09b0c33967
