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The justification for using relative source nodes in ZIR is that it allows source locations -- which may be serialized across incremental updates -- to be relative to the source location of their containing declaration. However, having those "baseline" instructions themselves be relative to their own parent is counterproductive, since the source location updating problem is only being moved to `Decl`. Storing the absolute node here instead makes more sense, since it allows for this source location update logic to be elided entirely in the future by storing a `TrackedInst.Index` to resolve a source location relative to rather than a `Decl.Index`.