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tu, ir3: geometryStreams

Connor Abbott requested to merge cwabbott0/mesa:review/tu-gs-streams into master

This is required by DXVK to expose feature level 10_1. There's a bit of ir3 support required, as well as some newly-reverse-engineered registers to program. This series also exposes all the other streams-related xfb features.

This is based on !6959 (merged), because there are a bunch of xfb tests that use clip/cull distances without checking if it's supported, but other than that they're independent. I could also add a bunch of expected failures if we want to land this first, I think.

Note that there's one patch to util/bitset, 7893108c. I'm not sure who's best to review that, maybe @jekstrand?

Edited by Connor Abbott

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