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Refactor Arm backend unit test to align with XNN-pack unit tests (#1971)

Summary:
Example usage:

`python -m unittest backends.arm.test.ops.test_add.TestSimpleAdd`

Pull Request resolved: https://github.com/pytorch/executorch/pull/1971

Reviewed By: kirklandsign

Differential Revision: D53824916

Pulled By: digantdesai

fbshipit-source-id: 807cd9696e1fa63a9b126c12ad1aecea5279ba94
F
Fredrik Knutsson committed
e4a78c233b64ae375f9ffaf1b6205b2f6653ea25
Parent: 899642b
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 2/16/2024, 1:45:50 AM