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ac/nir,radv: add lowering for emulating mesh/task shader queries on GFX10.3

Samuel Pitoiset requested to merge hakzsam/mesa:radv_ac_lowering_mesh_query into main

GFX10.3 doesn't support mesh/task queries and they need to be emulated, compared to GFX11 which supports them natively.

This is preliminary work for emulating mesh/task queries on GFX10.3.

I'm passing more than 90% of the CTS on both GFX10.3/GFX11 at the moment, but I found few CTS bugs and probably a spec bug too, so hard to reach 100% for now.

I will submit my other patches once they are finished/cleaned.

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