freedreno/a6xx: sample shading
Mostly contained in freedreno + ir3, but adds two new nir intrinsics and renames/adds some sysvals (which only freedreno/ir3 uses, but probably could be used by other drivers)
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Mostly contained in freedreno + ir3, but adds two new nir intrinsics and renames/adds some sysvals (which only freedreno/ir3 uses, but probably could be used by other drivers)