radv, aco: Lower txf offset in NIR.
Foz-DB Navi21:
Totals from 384 (0.28% of 134913) affected shaders:
VGPRs: 29736 -> 29536 (-0.67%)
CodeSize: 2455796 -> 2452652 (-0.13%); split: -0.13%, +0.01%
MaxWaves: 6350 -> 6358 (+0.13%)
Instrs: 457743 -> 456273 (-0.32%); split: -0.33%, +0.01%
Latency: 6680266 -> 6730612 (+0.75%); split: -0.03%, +0.78%
InvThroughput: 1562936 -> 1599375 (+2.33%); split: -0.05%, +2.38%
VClause: 9258 -> 9291 (+0.36%); split: -0.14%, +0.50%
SClause: 15713 -> 15707 (-0.04%); split: -0.08%, +0.04%
Copies: 26878 -> 27021 (+0.53%); split: -0.03%, +0.56%
PreVGPRs: 27259 -> 27230 (-0.11%); split: -0.11%, +0.01%