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add 16a8w matmul custom annotation (#5864)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/5864

As title, separate the 16a8w matmul custom annotation from the large chunk of PR.

Reviewed By: kirklandsign

Differential Revision: D63876215

fbshipit-source-id: 484fd93c31cda7b755e5e343fdc2513a29749304
C
Chen Lai committed
c2969f12aff9213092b3d7d509faba980c27ec0f
Parent: 20a157f
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 10/4/2024, 5:00:27 PM