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aco: Fix 8 and 16-bit addition reductions on GFX6-7

Timur Kristóf requested to merge Venemo/mesa:oland-reductions-fix into master

On GFX6-7, the 8 and 16-bit integer add reductions use the 32-bit v_add instruction, which clobbers the VCC register. But we forgot to mark it as such, which lead to test failures.

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