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nir,radv: use mbcnt_amd for ballot_bit_count_exclusive

Georg Lehmann requested to merge DadSchoorse/mesa:radv-subgroupBallotExclusiveBitCount into main 
Foz-DB Navi21:
Totals from 62 (0.05% of 134864) affected shaders:
VGPRs: 2464 -> 2440 (-0.97%)
CodeSize: 332408 -> 324276 (-2.45%)
MaxWaves: 1690 -> 1692 (+0.12%)
Instrs: 62356 -> 60828 (-2.45%)
Latency: 595723 -> 592554 (-0.53%)
InvThroughput: 126106 -> 124241 (-1.48%)
SClause: 2163 -> 2162 (-0.05%)
Copies: 6392 -> 6226 (-2.60%); split: -2.94%, +0.34%
Branches: 2295 -> 2298 (+0.13%)
PreSGPRs: 2390 -> 2389 (-0.04%)
PreVGPRs: 2139 -> 2117 (-1.03%); split: -1.08%, +0.05%

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