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asahi: Add ASAHI_MESA_DEBUG=nowc flag

Alyssa Rosenzweig requested to merge alyssa/mesa:agx/nowc into main

Add a debug flag to disable write-combining as a performance hack. This may help diagnose slowness with glReadPixels() heavy workloads like screen capture.

Signed-off-by: Alyssa Rosenzweig alyssa@rosenzweig.io

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