[Nouveau] nv50: wfb patches

[Maarten Maathuis]

Updated patches, with one performance improvement. Not checking for
tiled pixmaps when all pending pixmaps are linear. This reduces the
overhead to the point that you are doing small memcopies instead of a
large one.

I think i solved the XSHM problem, simply by accelerating it
(http://cgit.freedesktop.org/xorg/xserver/commit/?id=1b5758bef0840c6614244e321790231b3c9477c9).

I'll be fading to the background for a few months pretty soon, so
questions that involve access to my main machine (running nouveau,
xorg-git, etc) should be asked soon (less than a week).

Maarten.
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