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Draft: iris: Limit clear color changes to avoid resolves

Nanley Chery requested to merge nchery/mesa:perf/no-resolve-clears into main

Instead of resolving to change the clear color, fall back to slow clears.

No regressions observed in the performance CI. I tested a number of traces on SKL and was only able to find 3 clear calls which take the new fall-back path in a DiRT Rally benchmark. Each call targets different resources and they all seem to occur at the game loading screen.

Edited by Nanley Chery

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