[not for merge] Add armv8 support in buck shim

[digantdesai]

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✅ You can merge normally! (1 Unrelated Failure)

As of commit cd5a3fa with merge base 5bf8e99 ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-models-linux (mobilebert, portable, linux.2xlarge) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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