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aco: check scratch sgpr/scc writes caused by pseudo instructions during post-RA optimizations

Georg Lehmann requested to merge DadSchoorse/mesa:aco-f-scratch-reg into main

Having potential register writes that aren't definitions is messy, but changing that potentially breaks assumptions in a lot of places.

This solution isn't pretty I guess, and it causes some minor stats regressions that look unnecessary. But it should work.

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