[SIMD] Avoid parameter-passing-abi note, again.
Change all by-value parameters to simd functions that might be simd vectors or masks to const-ref parameters. This means they don't have to be split into multiple simd registers if the current abi does not have large enough registers, I'm guessing.
Closes: #164 (closed) See also: !607 (merged)
WIP:
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Manually verify the warnings are really gone.
Edited by Jö Fahlke