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panfrost: Copy resources when necessary

Alyssa Rosenzweig requested to merge alyssa/mesa:panfrost/buffer-fixes into main

If the map doesn't set MAP_DISCARD_RANGE, we do have to copy the existing contents over. MAP_WRITE on its only gives permission to replace the contents, unfortunately it does not require that the application actually do so.

Closes: #7640 (closed) Fixes: 0b26a9f7 ("panfrost: Don't copy resources if replaced") Signed-off-by: Alyssa Rosenzweig Reported-by: Roman Elshin

Cc @bbrezillon on the whole series

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