so that the CPR analysis find the real constructor and can return a
nested CPR result.

An alternative would be to look through the unfolding and analize that
(but that would only be a good idea if the wrapper is going to be
inlined afterwards), or special-case wrappers in the demand analyzer.
Both not very nice.

According to nofib: The impact of this is (on code size and allocations)
is ... nil.