8014647: Allow class-based overrides to be initialized with a ScriptFunction
Reviewed-by: hannesw, jlaskey, sundar
[object Null]
[object Undefined]
[object Arguments]
[object Array]
[object Boolean]
[object Date]
[object Function]
[object JSON]
[object Math]
[object Number]
[object Object]
[object RegExp]
[object String]
[object Boolean]
[object Number]
[object String]