Arm backend: Fix bug in ScalarsToAttributePass

[oscarandersson8218]

Summary

The pass should not modify the scalar argument if output is non-float. Also makes CastInt64ToInt32Pass more verbose and robust.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/7054

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❌ 2 New Failures, 4 Unrelated Failures

As of commit a01264a with merge base fbee0c8 ():

NEW FAILURES - The following jobs have failed:

• pull / test-llama-runner-qnn-linux (fp32, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t b9c859325046973e8134cdd91bb6c21848b3ed49a15dbb505f138a13e00f5b74 /exec failed with exit code 1
• trunk / test-models-macos (cmake, add_mul, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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

• trunk / test-models-macos (cmake, ic3, portable, macos-m1-stable, 90) / macos-job (gh) (similar failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos (cmake, mv2_untrained, portable, macos-m1-stable, 90) / macos-job (gh) (similar failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script 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

• trunk / test-coreml-delegate / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• trunk / test-models-macos (cmake, emformer_join, xnnpack-quantization-delegation, macos-m1-stable, 90) / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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[oscarandersson8218]

CI failures seem unrelated to this change.