8024255: When a keyword is used as object property name, the property can not be deleted
Reviewed-by: jlaskey, lagergren
[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]