Register iterator types with the correct size

src/runtime/dict.cpp

@@ -696,8 +696,8 @@ static Box* dict_repr(PyObject* self) noexcept {
 }
 
 void setupDict() {
-    dict_iterator_cls = BoxedHeapClass::create(type_cls, object_cls, &dictIteratorGCHandler, 0, 0, sizeof(BoxedDict),
-                                               false, "dictionary-itemiterator");
+    dict_iterator_cls = BoxedHeapClass::create(type_cls, object_cls, &dictIteratorGCHandler, 0, 0,
+                                               sizeof(BoxedDictIterator), false, "dictionary-itemiterator");
 
     dict_keys_cls = BoxedHeapClass::create(type_cls, object_cls, &dictViewGCHandler, 0, 0, sizeof(BoxedDictView), false,
                                            "dict_keys");

src/runtime/list.cpp

@@ -1083,8 +1083,8 @@ extern "C" int PyList_SetSlice(PyObject* a, Py_ssize_t ilow, Py_ssize_t ihigh, P
 }
 
 void setupList() {
-    list_iterator_cls = BoxedHeapClass::create(type_cls, object_cls, &listIteratorGCHandler, 0, 0, sizeof(BoxedList),
-                                               false, "listiterator");
+    list_iterator_cls = BoxedHeapClass::create(type_cls, object_cls, &listIteratorGCHandler, 0, 0,
+                                               sizeof(BoxedListIterator), false, "listiterator");
     list_reverse_iterator_cls = BoxedHeapClass::create(type_cls, object_cls, &listIteratorGCHandler, 0, 0,
                                                        sizeof(BoxedListIterator), false, "listreverseiterator");
 

src/runtime/set.cpp

@@ -488,8 +488,8 @@ extern "C" PyObject* PyFrozenSet_New(PyObject* iterable) noexcept {
 using namespace pyston::set;
 
 void setupSet() {
-    set_iterator_cls = BoxedHeapClass::create(type_cls, object_cls, &setIteratorGCHandler, 0, 0, sizeof(BoxedSet),
-                                              false, "setiterator");
+    set_iterator_cls = BoxedHeapClass::create(type_cls, object_cls, &setIteratorGCHandler, 0, 0,
+                                              sizeof(BoxedSetIterator), false, "setiterator");
     set_iterator_cls->giveAttr(
         "__iter__", new BoxedFunction(boxRTFunction((void*)setiteratorIter, typeFromClass(set_iterator_cls), 1)));
     set_iterator_cls->giveAttr("__hasnext__",