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radv/rt: create traversal shader independent from main shader

Daniel Schürmann requested to merge daniel-schuermann/mesa:radv_rt_traversal into main

In future, it will be necessary to be able to compile the traversal shader independently from the main shader.

 PERCENTAGE DELTAS Shaders  CodeSize   Instrs   Latency  InvThroughput   Copies   Branches 
 q2rtx             49        -0.06%    -0.11%    -2.01%      -1.99%      -1.02%    -0.33%  
 -------------------------------------------------------------------------------------------
 All affected      7         -0.10%    -0.19%    -2.52%      -2.56%      -1.48%    -0.44%  
 -------------------------------------------------------------------------------------------
 Total             49        -0.06%    -0.11%    -2.01%      -1.99%      -1.02%    -0.33%

Stats look mixed, but benchmarks suggest that it slightly improves performance. With the added patch, stats look fine now :)

Edited by Daniel Schürmann

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