r600/sfn: fix some issues
This series fixes a bunch of little issues and starts preparing the implementation of instrruction dependency tracking so that later some copy propagation and dce can be run.
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
This series fixes a bunch of little issues and starts preparing the implementation of instrruction dependency tracking so that later some copy propagation and dce can be run.