[Nouveau] nv50: wfb patches

[Maarten Maathuis]

Not much has changed, except that i've test run these patches for a
few weeks now.

I'm actually surprised i've avoided Out-Of-Memory issues.

Patch 2 remains a temporary hack, awaiting a structural fix by darktama.

The whole thing works fine, but XSHM is an issue
(http://stillunknown.livejournal.com/928.html). With it disabled most
apps are fine, although a few issues remain.

As long as rendering isn't too dependent on software rendering (in
pixman) then things are fine (better?).

I will be away for some time in a few weeks, so i'm not sure if i will
see the proper solution to patch 2.

Maarten.
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