Alyssa Rosenzweig e0b0f7e73c nir: add ALU reassocation pass
See the comment at the top file :-)

The ideas in this pass are based on LLVM. The implementation itself is from
scratch because have you /tried/ to read that thing?

Because LLVM and therefore prop drivers do these optimizations, this should help
narrow Mesa's performance gap with the blobs.

This probably needs some tuning for best results on other ISAs, but the stats
for AGX speak for themselves, see next commits.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Acked-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Mel Henning <mhenning@darkrefraction.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36147>
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`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library
======================================================


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------

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---------------

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