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nir: CSE ssa_undef instructions + noise

Konstantin Seurer requested to merge KonstantinSeurer/mesa:ray-query-reg-pressure into main 
PERCENTAGE DELTAS Shaders   VGPRs    CodeSize  Scratch    Instrs   Latency  InvThroughput  VClause   SClause    Copies   Branches  PreVGPRs 
 control           1463        .       -0.00%      .       -0.00%    -0.00%      -0.00%        .         .       -0.00%      .       -0.02%  
 deathloop         4078        .       -0.00%      .       -0.01%    -0.00%      -0.00%        .       +0.02%    -0.05%      .         .     
 ds1               1472        .         .         .         .         .           .           .         .         .         .         .     
 q2rtx-pipe        48        +1.91%    -0.07%    +2.70%    +0.02%    +0.01%      +0.01%      -0.18%      .       +0.15%    -0.04%    +0.69%  
 q2rtx/q2rtx_1     49          .         .         .         .         .           .           .         .         .         .         .     
 test_dynamic      1           .         .         .         .         .           .           .         .         .         .         .     
 test_uniform      1           .         .         .         .         .           .           .         .         .         .         .     
 ---------------------------------------------------------------------------------------------------------------------------------------------
 All affected      147       +0.23%    -0.04%    +5.00%    -0.04%    -0.01%      -0.01%      -0.02%    +0.09%    -0.20%    -0.00%    +0.03%  
 ---------------------------------------------------------------------------------------------------------------------------------------------
 Total             7112      +0.01%    -0.00%    +0.01%    -0.00%    -0.00%      -0.00%      -0.00%    +0.01%    -0.04%    -0.00%    +0.00%
Edited by Konstantin Seurer

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