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iris: Support clears in more GPU-based copies

Nanley Chery requested to merge nchery/mesa:perf/bsi-copy-resolves into master

Commit 7779b1d7, disabled clear support when copying to/from color buffers. According to the performance CI, it falls within a range of commits that introduced a performance regression on Bioshock Infinite with Tigerlake.

By analyzing a trace of the game, I found a couple cases where that commit added new partial resolves. This MR avoids them. I haven't tested the actual performance impact of this change, but it should be beneficial regardless.

Reported-by: @craftyguy , @jljusten

Edited by Nanley Chery

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