Add hardswish operator to Arm backend

[tom-arm]

Signed-off-by: Tom Allsop tom.allsop@arm.com

Change-Id: Id746a8a66f6e1db7e0ea12689c7fc272d6c15420

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8136

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❌ 2 Cancelled Jobs, 2 Unrelated Failures

As of commit 98e9fc2 with merge base a5c7609 ():

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• trunk / test-apple-model / macos-job (gh)
  ##[error]The operation was canceled.
• trunk / test-models-macos (cmake, llama, portable, macos-m1-stable, 90) / macos-job (gh)
  ##[error]The operation was canceled.

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-eval_llama-mmlu-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-llava-runner-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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