WIP: radeonsi support for clover nir

Open Dave Airlie requested to merge airlied/mesa:radeonsi-clover-nir into main

This is an initial set of patches to enable the NIR clover paths on radeonsi.

It needs AMD_CL_NIR=1 to switch to the nir paths.

There are some clover/nir patches in this that belong to !15876

Edited by Dave Airlie

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