Add mypy ignore for snakeviz

[perheld]

Add a import-untyped for snakeviz in the case it is installed.

Signed-off-by: per.held@arm.com
Change-Id: Ia951a0013d09e06c0d29a32bdb6b49ae11561d7d

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15806

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❌ 2 New Failures, 3 Unrelated Failures

As of commit 4ea0bce with merge base 65d4b94 ():

NEW FAILURES - The following jobs have failed:

• Apple / build-demo-ios / macos-job (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 74
• 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

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
  exir/backend/test/test_lowered_backend_module.py::TestBackendAPI::test_emit_nested_lowered_backend_module
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  exir/backend/test/test_lowered_backend_module.py::TestBackendAPI::test_emit_nested_lowered_backend_module
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  exir/backend/test/test_lowered_backend_module.py::TestBackendAPI::test_emit_nested_lowered_backend_module

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[zingo]

Hi @metascroy here is one PR outside or Arm stuff we might want help to review!

[meta-codesync]

@metascroy has imported this pull request. If you are a Meta employee, you can view this in D87489291.

[zingo]

Rebased to make sure the cortex-m size test has been fixed. This PR should not in any way cause problems in it but its nice to prove green CI on all Arm tests.

[zingo]

@metascroy I rebased this after your import and need a re-import, Thinking about about it the rebase was a bit stupid but now its done. Sorry for the extra work.

[metascroy]

Hi @metascroy here is one PR outside or Arm stuff we might want help to review!

The internal tests look good if you want to merge