[Mesa-dev] r600g: Use evergreen_cb() for compute

[Tom Stellard]

Hi,

This patch series makes it possible for the compute code to use
evergreen_cb() for binding RATs and should fix compute on newer
kernels.

Even though these changes are mostly focused on compute, they 
do modify some core driver code (mostly evergreen_cb() and a
few new register emission functions in r600_hw_context.c),
so I would appreciate some feedback from other r600g devs.

Thanks,
Tom