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Also silence warnings
Also, make LCA part of the tree API
Since we already do a DFS, we can save the RPO numbers and enforce that children are sorted by it. This affects several downstream passes.
Instead of changing the IR definition (which would affect many downstream consumers), we can work around this using some existing constructs in the language.
When optimized, the compiler turns this into a lookup table, but we can do even better by just turning it into a shift. However, it requires an unsafe cast.
Also add more tests
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