Patches for SI

[Christian König]

Hi Michel,

attached are the next bunch of improvements for the SI llvm backend.

Since Tom is on vacation it's probably on us to review them ourself. 
They are stabilizing the register allocation, and so should make it 
possible to use RegPressure scheduling again without running out of 
registers in (for example) lightsmark.

The matching mesa patches should hit the list in a couple of minutes.

Thanks,
Christian.
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