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aco: compute live-in variables instead of live-out variables

Daniel Schürmann requested to merge daniel-schuermann/mesa:aco_live_in into main

Since register allocation and spilling both use the live-in variables (after computing them in a separate pass) rather than the live-out variables, it seem natural to directly store the live-in variables. (Printing the live-in variables is also more readable, in my opinion.) It seems to be about ~0.5% faster in total compile times as well.

No fossil changes.

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