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aco: don't optimize DPP across more than one block

Georg Lehmann requested to merge DadSchoorse/mesa:aco-dpp-safe into main

Register write tracking doesn't work for inactive lanes, so this was unsafe.

Foz-DB Navi31:
Totals from 8 (0.01% of 78196) affected shaders:
Instrs: 11513 -> 11515 (+0.02%)
CodeSize: 61056 -> 61064 (+0.01%)

Cc: mesa-stable

Closes: #10197 (closed)

Edited by Georg Lehmann

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