Stabilize the global table insertion order in the new lookup code #2712
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To be (for now) bug for bug compatible with the legacy lookup system, we still allow certain global lookups. However, because they are ambiguous, they can resolve differently between runs depending on the internal implementation of Dart, memory pressure, the weather.... if the tables are not constructed with a consistent order when entries overlap.
What we really need to do is remove the ambiguity, as in the TODOs.