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4a5715b97a
## Summary
This function is huge, and hugely indented. This PR breaks most of it
out into two helper functions: `KnownFunction::check_call()` and
`KnownClass::check_call`.
My immediate motivation is that we need to add yet more special cases to
this function in order to properly handle `tuple` instantiations and
instantiations of tuple subclasses. But I really don't relish the
thought of doing that with the function's current structure 😆
## Test Plan
Existing tests all pass. No new ones are added; this is a pure refactor
that should have no functional change.