Arm backend: Add --enable_debug_mode to AOT compiler

[tom-arm]

• Add --enable_debug_mode to enable ATen to TOSA debugging
• Dump ATen graph when --intermediates is enabled
• Add missing _serialize_operator() calls

Signed-off-by: Tom Allsop [email protected]

Change-Id: Ibb8f03594c6afac887ef177a70034a210b31441a

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/14145

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❌ 2 New Failures, 2 Cancelled Jobs, 5 Unrelated Failures

As of commit 9668b5c with merge base 4d6209b ():

NEW FAILURES - The following jobs have failed:

• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t d51d20402c7abb5a5a0fe66d8afe08d0b341acd5e9cdbc51dfc9421e7123e462 /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

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

• pull / test-openvino-linux / linux-job (gh)
• trunk / test-models-windows (mv3, xnnpack-f32) / windows-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-setup-linux-gcc / linux-job (gh) (similar failure)
  ##[error]The operation was canceled.
• trunk / test-models-windows (emformer_transcribe, xnnpack-f32) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• trunk / test-models-windows (mv2, xnnpack-f32) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)

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-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-samsung-models-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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