[CS] Move getUnopenedTypeOfReference out of TypeChecker #30359
Merged
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For some reason, the changed caller in CS wasn't actually going to use any of the types in the constraint system from the entrypoint it was calling. Switch over to using the constraint-system based entrypoint so we can pick up expression types consistently. Then, move the TypeChecker entrypoint onto ConstraintSystem to reduce the duplication here.
The remaining callers of buildCheckedRefExpr should probably be migrated to use a more principled method of building typechecked ASTs.