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nir/algebraic: optimize Cyberpunk 2077's open-coded bitfieldReverse()

Rhys Perry requested to merge pendingchaos/mesa:nir_cp2077_bfrev into main

fossil-db (Sienna Cichlid):

Totals from 9 (0.01% of 128647) affected shaders:
CodeSize: 29900 -> 28640 (-4.21%)
Instrs: 5677 -> 5443 (-4.12%)
Latency: 96561 -> 95025 (-1.59%)
Copies: 571 -> 544 (-4.73%)

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