Automated submodule update: FBGEMM (#42584)
Summary:
This is an automated pull request to update the first-party submodule for [pytorch/FBGEMM](https://github.com/pytorch/FBGEMM).
New submodule commit: https://github.com/pytorch/FBGEMM/commit/4abc34af1a0e7775a5a62f674fd6c928ad3162ad
Pull Request resolved: https://github.com/pytorch/pytorch/pull/42584
Test Plan: Ensure that CI jobs succeed on GitHub before landing.
Reviewed By: dskhudia
Differential Revision: D22941475
fbshipit-source-id: 29863cad7f77939edb44d337918693879b35cfaa
