Joe Calzaretta bb3467b8e1 Handle type guard predicates on Array<T>.find (#18160) ...

* Handle type guard predicates on `Array<T>.find`

If the `predicate` function passed to `Array<T>.find` or `ReadonlyArray<T>.find`
is a type guard narrowing `value` to type `S`, then any returned element should also
be narrowed to `S`.

Adding test case and associated baselines

* trailing whitespace after merge conflict

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baselines/reference

Handle type guard predicates on Array<T>.find (#18160)

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cases

Handle type guard predicates on Array<T>.find (#18160)

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perfsys.ts

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test.bat

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