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radv: Add VRS support for mesh shaders.

Timur Kristóf requested to merge Venemo/mesa:radv-mesh-shader-vrs into main

This builds on MR !13580 (merged) and adds support for per-primitive VRS rates.

The differences between other shaders and mesh shaders are listed here:

VS, TES, GS MS
Output type per-vertex per-primitive
Export instr exp pos1 exp prim
Export channel 0 1
Encoded export bits bits 2:5 bits 28:31
VRS rate combiner vertex primitive
Edited by Timur Kristóf

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