[runtime] We don't need an actual instance type for JSIteratorResult.

src/objects-printer.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/objects.h"
 
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/interpreter/bytecodes.h"
 #include "src/objects-inl.h"
@@ skipping 128 matching lines @@
       break;
     case JS_MAP_TYPE:
       JSMap::cast(this)->JSMapPrint(os);
       break;
     case JS_SET_ITERATOR_TYPE:
       JSSetIterator::cast(this)->JSSetIteratorPrint(os);
       break;
     case JS_MAP_ITERATOR_TYPE:
       JSMapIterator::cast(this)->JSMapIteratorPrint(os);
       break;
-    case JS_ITERATOR_RESULT_TYPE:
-      JSIteratorResult::cast(this)->JSIteratorResultPrint(os);
-      break;
     case JS_WEAK_MAP_TYPE:
       JSWeakMap::cast(this)->JSWeakMapPrint(os);
       break;
     case JS_WEAK_SET_TYPE:
       JSWeakSet::cast(this)->JSWeakSetPrint(os);
       break;
     case FOREIGN_TYPE:
       Foreign::cast(this)->ForeignPrint(os);
       break;
     case SHARED_FUNCTION_INFO_TYPE:
@@ skipping 631 matching lines @@
   OrderedHashTableIteratorPrint(os);
 }
 
 
 void JSMapIterator::JSMapIteratorPrint(std::ostream& os) {  // NOLINT
   JSObjectPrintHeader(os, this, "JSMapIterator");
   OrderedHashTableIteratorPrint(os);
 }
 
 
-void JSIteratorResult::JSIteratorResultPrint(std::ostream& os) {  // NOLINT
-  JSObjectPrintHeader(os, this, "JSIteratorResult");
-  os << "\n - done = " << Brief(done());
-  os << "\n - value = " << Brief(value());
-  os << "\n";
-}
-
-
 void JSWeakMap::JSWeakMapPrint(std::ostream& os) {  // NOLINT
   JSObjectPrintHeader(os, this, "JSWeakMap");
   os << "\n - table = " << Brief(table());
   JSObjectPrintBody(os, this);
 }
 
 
 void JSWeakSet::JSWeakSetPrint(std::ostream& os) {  // NOLINT
   JSObjectPrintHeader(os, this, "JSWeakSet");
   os << "\n - table = " << Brief(table());
@@ skipping 505 matching lines @@
 void JSObject::PrintTransitions(std::ostream& os) {  // NOLINT
   Object* transitions = map()->raw_transitions();
   int num_transitions = TransitionArray::NumberOfTransitions(transitions);
   if (num_transitions == 0) return;
   os << "\n - transitions";
   TransitionArray::PrintTransitions(os, transitions, false);
 }
 #endif  // defined(DEBUG) || defined(OBJECT_PRINT)
 }  // namespace internal
 }  // namespace v8