Arm backend: Add decomposition of div.Tensor_mode

[wwwind]

Add decomposition of div.Tensor_mode

Signed-off-by: Elena Zhelezina [email protected]

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13940

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❌ 4 New Failures, 1 Unrelated Failure

As of commit 0d3d423 with merge base 01258d2 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t bd254276cdd4dcd354b482db174f079852ff7451b28c4f8ca059a3956803b1d9 /exec failed with exit code 1
• trunk / test-llama-runner-mac (fp32, coreml) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-models-linux-aarch64 (qwen2_5, portable, linux.arm64.2xlarge) / linux-job (gh)
  RuntimeError: Command docker exec -t 911b72d4adc3b0aa29eb4149bf1848aad049fb99a551c7d484796c6cbc1cfd57 /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• trunk / test-models-linux-aarch64 (llama3_2_vision_encoder, portable, linux.arm64.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[zingo]

@wwwind there seem to be some fails regarding div for Ethos-U55

[wwwind]

@zingo everything was green on gerrit for me

[wwwind]

i can close this PR and go through internal testing again

[zingo]

Maybe add @common.XfailIfNoCorstone300

[wwwind]

oh, yes, missed yhis

[zingo]

Fails unrelated