radv,aco,llvm: lower post shuffle vertex in NIR

radv,aco,llvm: lower post shuffle vertex in NIR

fossils-db (Sienna Cichlid):
Totals from 774 (0.57% of 134913) affected shaders:
VGPRs: 26496 -> 26312 (-0.69%)
CodeSize: 1825936 -> 1828812 (+0.16%); split: -0.04%, +0.20%
MaxWaves: 22046 -> 22062 (+0.07%)
Instrs: 347634 -> 347975 (+0.10%); split: -0.05%, +0.15%
Latency: 1363949 -> 1356426 (-0.55%); split: -0.59%, +0.04%
InvThroughput: 221529 -> 221380 (-0.07%); split: -0.10%, +0.04%
VClause: 5682 -> 5676 (-0.11%); split: -1.46%, +1.36%
SClause: 7485 -> 7411 (-0.99%); split: -1.48%, +0.49%
Copies: 30481 -> 30420 (-0.20%); split: -0.51%, +0.31%
PreVGPRs: 19717 -> 19656 (-0.31%)

fossil-db (Polaris10):
Totals from 896 (0.66% of 135960) affected shaders:
SGPRs: 49824 -> 49648 (-0.35%); split: -0.39%, +0.03%
VGPRs: 31040 -> 29948 (-3.52%); split: -3.62%, +0.10%
CodeSize: 875960 -> 875920 (-0.00%); split: -0.06%, +0.05%
MaxWaves: 6380 -> 6429 (+0.77%)
Instrs: 171522 -> 171482 (-0.02%); split: -0.07%, +0.05%
Latency: 1356082 -> 1334386 (-1.60%); split: -1.61%, +0.01%
InvThroughput: 553389 -> 552957 (-0.08%); split: -0.08%, +0.00%
VClause: 4317 -> 4244 (-1.69%); split: -2.41%, +0.72%
SClause: 6157 -> 6139 (-0.29%); split: -0.45%, +0.16%
Copies: 9340 -> 9235 (-1.12%); split: -1.24%, +0.12%
PreVGPRs: 22366 -> 22116 (-1.12%)

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15113>