truct templates, that
would be a mess.

This leads to some unfortunate duplication with the old dri1 code, but
we can reap that again because gen6 isn't actually supported there.
But that's for a separate patch.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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