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nir: lower pack_uvec4_to_uint to pack_32_4x8 if supported

Georg Lehmann requested to merge DadSchoorse/mesa:nir-pack-int-to-4x8 into main 
Foz-DB Navi31:
Totals from 42 (0.05% of 79395) affected shaders:
Instrs: 3326544 -> 3324640 (-0.06%)
CodeSize: 16908376 -> 16896212 (-0.07%); split: -0.07%, +0.00%
VGPRs: 4284 -> 4296 (+0.28%)
Latency: 17862544 -> 17855438 (-0.04%); split: -0.05%, +0.01%
InvThroughput: 3535291 -> 3533993 (-0.04%); split: -0.04%, +0.00%
VClause: 95270 -> 95275 (+0.01%); split: -0.01%, +0.01%
SClause: 65402 -> 65397 (-0.01%)
Copies: 229723 -> 234124 (+1.92%)
Branches: 109481 -> 109518 (+0.03%); split: -0.00%, +0.04%
PreVGPRs: 3879 -> 3909 (+0.77%)
VALU: 1789208 -> 1787370 (-0.10%); split: -0.10%, +0.00%
SALU: 409136 -> 409129 (-0.00%); split: -0.00%, +0.00%

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