Fix ios benchmark app

[jackzhxng]

Fixes the ios benchmark app, dependent on pytorch-labs/tokenizers#62

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/10543

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 4 New Failures, 3 Pending

As of commit 6ecfa98 with merge base c723212 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  RuntimeError: Command docker exec -t a3e4d356ceb2d08b4ba7493f5a962115cfd29512bc97b71870239099c268cf03 /exec failed with exit code 1
• pull / android / build-llm-demo / linux-job (gh)
  RuntimeError: Command docker exec -t c39ead0da5eeab0939ab6eab2fcb4a9770639da0188591f51f774b240841bba8 /exec failed with exit code 1
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 44f312fc31f10ce84e903d500c9878d148189d2fd9dc8b8452c6b5a5d20928cb /exec failed with exit code 127
• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 3deed93472e99492d14f777ded6b45a5b131a09c73fb8354381f812fb5d0a5f3 /exec failed with exit code 127

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[shoumikhin]

LGTM assuming the app was able to measure some llama model perf successfully.
Please address the LLaMA app too.

[facebook-github-bot]

@jackzhxng has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[jackzhxng]

Manually validated the benchmarking app by benchmarking stories110M and Qwen3