add redefinedSlots for PStructUnpackIterator, since these are intrinsified in enterprise, but not in CE

Author: timfel

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/PythonBuiltinClassType.java

@@ -656,6 +656,7 @@ public final Shape getInstanceShape(PythonLanguage lang) {
         UnicodeDecodeError.redefinedSlots = new SpecialMethodSlot[]{SpecialMethodSlot.Str};
         UnicodeTranslateError.redefinedSlots = new SpecialMethodSlot[]{SpecialMethodSlot.Str};
         OSError.redefinedSlots = new SpecialMethodSlot[]{SpecialMethodSlot.Str};
+        PStructUnpackIterator.redefinedSlots = new SpecialMethodSlot[]{SpecialMethodSlot.Next, SpecialMethodSlot.Iter, SpecialMethodSlot.LengthHint};
 
         // These slots actually contain context independent values, but they are initialized in
         // StructSequence to artificial PBuiltinFunctions with artificial builtin node factories,