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nir/algebraic: shrink 64-bit bitwise operations with 0/-1 constant half

Rhys Perry requested to merge pendingchaos/mesa:nir_algebraic_shrink_64bit_bitwise into main

fossil-db (navi21):

Totals from 457 (0.34% of 135636) affected shaders:
Instrs: 259349 -> 250383 (-3.46%)
CodeSize: 1411976 -> 1369136 (-3.03%)
Latency: 2175961 -> 2148158 (-1.28%)
InvThroughput: 502206 -> 490244 (-2.38%)
Copies: 15238 -> 15232 (-0.04%); split: -0.07%, +0.03%

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