Fix LLaMa beam search when using parallelize

[FeiWang96]

What does this PR do?

This PR fixes a crash when running beam search on LLaMa on multiple GPUs. Similar issue is also observed and fixed on T5 #11717

Fixes # (issue)

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests?

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[HuggingFaceDocBuilderDev]

The documentation is not available anymore as the PR was closed or merged.

[amyeroberts]

Thanks for fixing!

[amyeroberts]

@FeiWang96 The quality checks are currently failing. To resolve these, run make style at the top level of the repo and commit any changes made.

[FeiWang96]

Hi @amyeroberts , thank you for approving. I've fixed the code format issue. However, the ci failed on other tests due to some network issues. I don't have the permission to rerun.

[amyeroberts]

@FeiWang96 Re-ran and all passing now. Thanks again!