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anv: limit render target cache flushing due to color output remapping

Lionel Landwerlin requested to merge llandwerlin/mesa:review/anv-optimize-rt-changes into main

What does this MR do and why?

anv: limit render target cache flushing due to color output remapping

Track what render target are accessed by a fragment shader and by
diffing the previous render target use, determine whether a render
target cache flush is required between 2 pipelines.

Fixes a performance regression of 1%/2% introduced in badb3f6301
("anv: Only flush render target cache when detecting RT changes")

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

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