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Use custom cpp op for packing 4 bit weights (#1899)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/1899

It is extremely slow otherwise
ghstack-source-id: 215452811
exported-using-ghexport

Reviewed By: digantdesai

Differential Revision: D53594767

fbshipit-source-id: a7af8e4aea86c6ef7dec6036d0257dbc7b323a59
K
Kimish Patel committed
5c6cefcc9b7646c151df86d26ad26af93ac3fe85
Parent: b601b49
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 2/16/2024, 5:44:16 PM