Fix TypedArrays.prototype.constructor reference

[leobalter]

Fix the reference so a Float32Array.prototype.constructor references the
corresponding Float32Array object, etc.

The %TypedArray% constructor is not called anymore and it should not be
the reference for TypedArray instances

[anba]

%_TypedArray_% is actually correct in this context, because _TypedArray_ refers to the current TypedArray instantiation. So when TypedArray is the constructor name "Float64Array", %TypedArray% (%_TypedArray_%) is the intrinsic object %Float64Array%.

That being said, we should probably just pick a different variable name for TypedArray.

[leobalter]

You're right.

That being said, we should probably just pick a different variable name for TypedArray.

Yes. I'll need to bring it to another PR / issue.