Don't only apply DDP optimizer on forward frames (#87097)
Previously a check would only apply DDP optimizer on frames named "forward".
But on hf_T5_large, a graph break causes some frames like:
```
<graph break in _shift_right>
<graph break in forward>
```
So instead, apply DDP optimizer on all frames.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/87097
Approved by: https://github.com/wconstab
