R600: Various improvements to scheduler and packetizer

[Vincent Lejeune]

Hi

Another serie aiming at fixing some light inneficiencies in our scheduler and packetizer.

Currently packetizer does not pack instruction without a write bit ; however Op3 operand don't have such bit and are perfectly packetizable.
Second patch relaxes this constraints.
Third patch properly handle data dependency inside a packet candidate : we check if such dependency is real or if it is between 2 different subregs.
4th one remove extra COPY instructions that were appearing when we switched to bottom up scheduling
Last one implement the change suggested in a review by Tom.

Vincent
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