Arm backend: Add atan decomposition pass and test

[tbergkvist]

Decomposes atan using Padé approximation/lookup table for MI/BI case.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

[pytorch-bot]

🔗 Helpful Links

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❌ 2 New Failures, 1 Cancelled Job

As of commit b428bba with merge base ecb85ce ():

NEW FAILURES - The following jobs have failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 255
• 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

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-models-macos (w2l, xnnpack-quantization-delegation) / macos-job (gh)
  ##[error]The operation was canceled.

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[tbergkvist]

@pytorchbot label "release notes: arm"

[pytorch-bot]

Didn't find following labels among repository labels: release,notes:,arm

[tbergkvist]

@pytorchbot label "partner: arm"

[tbergkvist]

@pytorchbot label "release notes: arm"

[tbergkvist]

@pytorchbot label "ciflow/trunk"

[pytorch-bot]

To add these label(s) (ciflow/trunk) to the PR, please first approve the workflows that are awaiting approval (scroll to the bottom of this page).

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[pytorch-bot]

To add the ciflow label ciflow/trunk please first approve the workflows that are awaiting approval (scroll to the bottom of this page).

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[tbergkvist]

@pytorchbot label "ciflow/trunk"