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radeonsi: NIR equivalent of clear read-modify-write buffer

Ganesh Belgur Ramachandra requested to merge gbelgurr/mesa:nir-impl-clear-rmw into main

Implemented the NIR equivalent of the existing internal TGSI compute shader to clear a ready-modify-write buffer. The disassembly shader generated by the new NIR variant is identical to the previous implementation. These changes remove the additional conversion step from TGSI to NIR for the given shader at runtime. Tested on a Navi 23 card.

Edited by Ganesh Belgur Ramachandra

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