NXP backend: Extended support of HardTanh with new Neutron C flow

[StrycekSimon]

Summary

• Adjusted Clamp-related implementation for reuse in HardTanh as both operators share the same logic.
• Add new Neutron C flow support for HardTanh operator.

Test plan

Covered by newly added tests.

cc @robert-kalmar @JakeStevens @digantdesai @rascani

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/20177

• 📄 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, 2 Unrelated Failures

As of commit aceb746 with merge base 55c54c7 ():

NEW FAILURES - The following jobs have failed:

• pull / test-lora-multimethod-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 7471a32dd2b7c5a1e0851bd856640771c6cf672749787cefcde25085faf55152 /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 7bc0dde6cd85ed696ee9e4e2e61462b5104b9b83e15b0be5dadca8afef221dd6 /exec failed with exit code 1
• pull / unittest / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_resnet18_model
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 39ff79eb667eee2559156aa3b4ca94e3cddf77b2223f056deabc8b3aa8c7bbb8 /exec failed with exit 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 / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (trunk failure)
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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

[linux-foundation-easycla]

• ❌ - login: @MartinPavella / name: Martin Pavella. The commit (0a1c27b, aceb746) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please visit our EasyCLA portal and chat with our support bot.
• ❌ - login: @StrycekSimon / name: Simon Strycek. The commit (e952b3a) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please visit our EasyCLA portal and chat with our support bot.

[MartinPavella]

@novak-vaclav please feel free to have a look.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review is ineligible. To be eligible to request a review, you need a paid Copilot license, or your organization must enable Copilot code review.

[robert-kalmar]

Nice, elegant solution! Love it.

[roman-janik-nxp]

Please rebase, resolve conflicts and fix license year.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review is ineligible. To be eligible to request a review, you need a paid Copilot license, or your organization must enable Copilot code review.