Adding a non-class-syntax method for subclassing native objects

Renki Ivanko fatalis.erratum at
Thu May 5 15:53:34 UTC 2016

It would be helpful to have the MakeConstructor operation implemented as
`Reflect.makeConstructor(F, writablePrototype, prototype)`, since otherwise
the alternative to the `class extends` syntax is very verbose. It would
also be consistent with the `Reflect.construct()` method corresponding to
the Construct abstract operation, and `Object.create()` mainly
corresponding to ObjectCreate.
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