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iris/icl+: Report same caching domain as main surface for clear color BO.

Francisco Jerez requested to merge currojerez/mesa:iris-cache-tracker-fixup-1 into master

Even though the clear color BO is bound as a read-only buffer, report the same caching domain as the main BO in use_surface() (typically IRIS_DOMAIN_RENDER_WRITE) in order to avoid ping-ponging back and forth between IRIS_DOMAIN_RENDER_WRITE and IRIS_DOMAIN_OTHER_READ, which leads to increased stall-at-pixel-scoreboard synchronization between draw calls.

Fixes a 5%-10% FPS regression in some benchmarks spotted on ICL.

Edited by Francisco Jerez

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