llvmpipe drop the last major tgsi outside draw integration

Merged Dave Airlie requested to merge airlied/mesa:llvmpipe-drop-some-tgsi into main

What does this MR do and why?

This is the final chunk of my first pass at dropping TGSI from llvmpipe.

Unfortunately dropping it from draw is a bit more effort, since draw does tgsi execution.

Edited by Dave Airlie

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