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anv: Fall back to slow clear if the image is small enough

Casey Bowman requested to merge cgbowman/mesa:slow-clear-fallback into main

What does this MR do and why?

anv: Fall back to slow clear if the image is small enough

Images of size 960x540 or smaller have potential to be cleared
faster through slow color clear instead of a normal CCS color clear.

Signed-off-by: Casey Bowman <casey.g.bowman@intel.com>

This MR has shown to have a perf improvement up to ~1% in testing on ACM:

slow_clear_testing.png

Edited by Casey Bowman

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