i965: Assert that we don't use CPU write maps to non-coherent buffers.
Using CPU maps of non-coherent buffers can get us in a lot of trouble, and WC maps are a reasonable alternative anyway. Guard against shooting ourselves in the foot by adding an assert, and comment. Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matt Turner <mattst88@gmail.com>
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