George Kalpakas 14744f27c5 refactor(compiler-cli): rename the BuiltinFn type to the more generic KnownFn (#35191)
This is in preparation of using the `KnownFn` type for known TypeScript
helpers (in addition to built-in functions/methods). This will in turn
allow simplifying the detection of both imported and emitted TypeScript
helpers.

PR Close #35191
2020-02-21 09:06:46 -08:00
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