Backport "Improve defn.PolyFunctionOf extractor" to LTS
#20663
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* Only match `RefinedType` representing the `PolyFunction`. This will allow us to use `derivedRefinedType` on the function type. * Only match the refinement if it is a `MethodOrPoly`. `ExprType` is not a valid `PolyFunction` refinement. * Remove `dealias` in `PolyFunctionOf` extractor. There was only one case where this was necessary and it added unnecessary overhead. [Cherry-picked 60b2d02][modified]
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No regressions detected in the community build up to lts-18731. |
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Backports #18442 to the LTS branch.
PR submitted by the release tooling.
[skip ci]