Qualcomm AI Engine Direct - Fixed the bug in dummy_llama2 script

[shewu-quic]

Summary:

• Add compile only argument in dummy_llama2

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/2587

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✅ You can merge normally! (1 Unrelated Failure)

As of commit cbb46c6 with merge base ec6b88a ():

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

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

• pull / unittest / macos (buck2) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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@cccclai merged this pull request in 24fe99c.