Arm backend: Add a simple weight sharing test

[digantdesai]

Summary

This fails on Vela.

FYI - Not planning to land this as is but want to use this as a repro.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13021

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❌ 1 New Failure

As of commit 9bb1868 with merge base da0c80a ():

NEW FAILURE - The following job has failed:

• Build Presets / apple (profiling) / build (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1

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[github-actions]

Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as Stale.
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