Nouveau - Oct 2009 - [PATCH] nv50/gallium: use SIFC to upload to TIC/TSC

If we use SIFC to upload the TIC and TSC (like the blob does) instead 
of the CB upload mechanism, we can remove the 2D.0100 flush without 
getting the issue that wrong (i.e. probably those set earlier) textures 
are used.

Looks like this might the better way, even though attempts to do the 
same in the DDX failed. This can provide a good speed boost in some 
cases, too.

I'll wait a while for potential comments before pushing this.

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