R600: Implement Bottom Up scheduling

[Vincent Lejeune]

Hi,

This serie implement bottom up scheduling, which is be less register hungry in most situations and 

improves packetization.

The new heuristic however perform badly when there are a lot of vector operations and thus crashes in
Unigine when Ambient Occlusion shader is compiled : it uses indeed a lot of dot4 operations.
The purpose of the first patch is to avoid such situation.
I still need to improve handling of copy from physical register (they currently translate to a MOV) in a
future patch.


Vincent
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