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11c85f0fb5
Removes steps from `ModuleVariableNode`s from `essaFlowStep`, and instead puts them only in `jumpStep`. This cleans up the logic a bit. This slightly broke the type tracker implementation (as it relied on `essaFlowStep` being fairly liberal), so I have rewritten it to explicitly rely on just familiar predicates for local and jump steps. Additionally, we disallow Essa-to-Essa steps where exactly one of the two nodes corresponds to a global variable (i.e. only local-local and global-global steps).