Arm backend: Test partial quantization of models on VGF

[martinlsm]

Run tests of partial quantization on the MobileNetV2 and Llama models using the VGF backend (INT+FP profile).

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16311

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❌ 8 New Failures, 2 Unrelated Failures

As of commit 5d0df2d with merge base 3233761 ():

NEW FAILURES - The following jobs have failed:

• Apple / build-benchmark-app / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Apple / build-demo-ios / macos-job (gh)
  No files were found with the provided path: /Users/runner/work/_temp/artifacts/. No artifacts will be uploaded.
• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 36dcbe55d6fdd53fc9f66665ccfcd8eb5c87ad73bc6b4638b1cd089d5fdf681b /exec failed with exit code 1
• trunk / test-arm-backend (test_pytest_models_ethosu_fvp) / linux-job (gh)
  RuntimeError: Command docker exec -t 631ed90e873df99859abd27993d97fb45ac9ce53087ed59a18d546fcb4d391ba /exec failed with exit code 1
• trunk / test-coreml-delegate / macos-job (gh)
  The process '/opt/homebrew/bin/git' failed with exit code 128
• trunk / test-huggingface-transformers-macos (distilbert|coreml_fp32_gpu|--quantize) / macos-job (gh)
  The process '/opt/homebrew/bin/git' failed with exit code 128
• trunk / test-huggingface-transformers-macos (llama3.2-1b|coreml_fp32_gpu|--quantize) / macos-job (gh)
  The process '/opt/homebrew/bin/git' failed with exit code 128
• trunk / test-multimodal-macos (gemma3-4b) / macos-job (gh)
  Operation timed out (codeload.github.com:443)

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

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

• Apple / build-frameworks-ios / macos-job (gh) (trunk failure)
  No files were found with the provided path: /Users/runner/work/_temp/artifacts/. No artifacts will be uploaded.

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

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[martinlsm]

@pytorchbot label ciflow/trunk

[martinlsm]

@pytorchbot label "partner: arm"

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[zingo]

Some CI fails, this might just need a rerun
FAILED backends/arm/test/misc/test_mixed_type_lowering.py::test_mixed_type_lowering - RuntimeError: Expected 2 occurencies of op='ADD', dtype='FP32' but found 6.
= 1 failed, 5985 passed, 2578 skipped, 176 xfailed, 14 xpassed, 36156 warnings in 5569.39s (1:32:49) =

Arm: test_T5ForConditionalGeneration_tosa_* fails are unrelated and fails without the PR

[zingo]

Known unrelated Arm fails
FAILED backends/arm/test/models/test_T5ForConditionalGeneration_arm.py::test_T5ForConditionalGeneration_tosa_FP
FAILED backends/arm/test/models/test_T5ForConditionalGeneration_arm.py::test_T5ForConditionalGeneration_tosa_INT
The rest of the fails are also unrelated to this PR