Benchmark Phi4-mini via optimum

[guangy10]

Summary

7.11 tokens/s on iPhone 15 Pro per the benchmark job

Test plan

benchmark job via CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11991

• 📄 Preview Python docs built from this PR

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❌ 2 New Failures, 4 Unrelated Failures

As of commit c2efb7a with merge base 478032a ():

NEW FAILURES - The following jobs have failed:

• apple-perf (private devices) / apple / benchmark-on-device (microsoft/Phi-4-mini-instruct, hf_xnnpack_custom_spda_kv_cache_8da4w, apple_... / mobile-job (ios) (gh)
  Final attempt failed. Child_process exited with error code 1
• apple-perf / benchmark-on-device (microsoft/Phi-4-mini-instruct, hf_xnnpack_custom_spda_kv_cache_8da4w, apple_... / mobile-job (ios) (gh)
  Final attempt failed. Child_process exited with error code 1

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

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

• pull / unittest / linux / linux-job (gh) (trunk failure)
  extension/llm/export/test/test_export_llm.py::TestExportLlm::test_with_config
• pull / unittest / macos / macos-job (gh) (trunk failure)
  extension/llm/export/test/test_export_llm.py::TestExportLlm::test_with_config
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  extension/llm/export/test/test_export_llm.py::TestExportLlm::test_with_config
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  extension/llm/export/test/test_export_llm.py::TestExportLlm::test_with_config

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