`model.tie_weights()` should be applied after `accelerator.prepare()`
# What does this PR do?
Weight tying should be done after the model has been moved to XLA device as mentioned on PyTorch/XLA Troubleshooting guide [here](https://github.com/pytorch/xla/blob/master/TROUBLESHOOTING.md#xla-tensor-quirks). This PR fixes this in `examples/pytorch/language-modeling/run_mlm_no_trainer.py` example script.



## Before submitting
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      Pull Request section?
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- [ ] Did you write any new necessary tests?

## Who can review ?
@sgugger @muellerzr
_The documentation is not available anymore as the PR was closed or merged._<|||||>Thanks @Gladiator07 great work! 