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radv, nir: optimize flrp(fadd, fadd, x) only if fadd are used_once

Daniel Schürmann requested to merge daniel-schuermann/mesa:nir_op_flrp into main 
Totals from 201 (0.13% of 150170) affected shaders: (GFX10.3)
VGPRs: 13880 -> 13856 (-0.17%)
CodeSize: 1517328 -> 1518124 (+0.05%); split: -0.04%, +0.10%
MaxWaves: 3184 -> 3192 (+0.25%)
Instrs: 285487 -> 285569 (+0.03%); split: -0.06%, +0.08%
Latency: 7774066 -> 7780877 (+0.09%); split: -0.10%, +0.19%
InvThroughput: 1936341 -> 1935287 (-0.05%); split: -0.07%, +0.02%
SClause: 11446 -> 11448 (+0.02%); split: -0.01%, +0.03%
Copies: 17500 -> 17506 (+0.03%); split: -0.51%, +0.55%
Branches: 8174 -> 8180 (+0.07%); split: -0.13%, +0.21%
PreVGPRs: 12507 -> 12427 (-0.64%)

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