PATCHES: R600/SI: Enable machine scheduler

[Tom Stellard]

Hi,

The attached patches enable the machine scheduler on SI subtargets as well as
enable register spilling for compute.  Enabling the scheduler improves performance
on the Unigine demos by 10% and Luxmark by 20%.

There is still a lot of room for improvement in the scheduler definitions and
the associated callbacks.  These patches just enable the scheduler and implement
a simple machine model.

-Tom
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