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ac/nir/mem_access_bit_sizes: split unaligned vec3 lds access to allow more read2/write2

Georg Lehmann requested to merge DadSchoorse/mesa:radv-split-lds-early into main

ACO will split them anyway because the hardware requires 16 byte alignment. By splitting in NIR the leftover single dword access can be combined with others.

Foz-DB Navi21:
Totals from 77 (0.10% of 79377) affected shaders:
Instrs: 69787 -> 68745 (-1.49%); split: -1.51%, +0.02%
CodeSize: 367256 -> 360060 (-1.96%); split: -1.97%, +0.01%
VGPRs: 3896 -> 3880 (-0.41%)
Latency: 335403 -> 335297 (-0.03%); split: -0.11%, +0.08%
InvThroughput: 102766 -> 102931 (+0.16%); split: -0.09%, +0.25%
VClause: 1645 -> 1643 (-0.12%); split: -0.18%, +0.06%
SClause: 1434 -> 1433 (-0.07%)
Copies: 4280 -> 4283 (+0.07%); split: -0.56%, +0.63%
PreVGPRs: 2408 -> 2421 (+0.54%); split: -0.08%, +0.62%
VALU: 45557 -> 45646 (+0.20%); split: -0.10%, +0.29%
SALU: 6458 -> 6474 (+0.25%)

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