Fix LLaMa beam search when using parallelize
Author: FeiWang96
Pull request: yes

# 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 

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Fixes # (issue)


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Comments:
_The documentation is not available anymore as the PR was closed or merged._

@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. 

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.

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