[Mesa-dev] i965: Adding comments and cleaning up push/pull constants

[Eric Anholt]

Since I'm leaving Intel in a couple weeks, I figured the best thing I
could do for the driver in that time would be to take a pass over the
whole codebase and braindump into the comments.  I didn't make it very far
without finding a lot of silly code that ought to be cleaned up, so I went
ahead and did that.

This code sits on top of the CURBE cleanups I sent out, and can be found
in the "comments" branch of my tree.