agx: RA improvements
Some clean up and RA improvements. This should be most of the prereqs before we can do live range splitting. In particular, precoloured sources are handled properly now.
Draft because I haven't run any of this through cts yet.
Some clean up and RA improvements. This should be most of the prereqs before we can do live range splitting. In particular, precoloured sources are handled properly now.
Draft because I haven't run any of this through cts yet.