Reviewed by Maciej.

    Reviewed by Maciej.

        - Changed JSObjectMakeConstructor to JSObjectMakeConstructorWithCallback,
        to match JSObjectMakeFunctionWithCallback.

        - Added prototype parameter, so the generated constructor
        automatically works with hasInstance / instanceof

        - Moved hasInstance implementation from InternalFunctionImp to JSObject
        so that subclasses can inherit it without inheriting function-related baggage.
        More refactoring here would be good, but this seems like a good short-term
        solution.

        (KJS::JSCallbackFunction::implementsHasInstance): override and return false,
        because callback functions aren't constructors.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@15482 268f45cc-cd09-0410-ab3c-d52691b4dbfc