[es6] Introduce a dedicated JSIteratorResult type.

src/objects-debug.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/bootstrapper.h"
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/macro-assembler.h"
@@ skipping 125 matching lines @@
       break;
     case JS_MAP_TYPE:
       JSMap::cast(this)->JSMapVerify();
       break;
     case JS_SET_ITERATOR_TYPE:
       JSSetIterator::cast(this)->JSSetIteratorVerify();
       break;
     case JS_MAP_ITERATOR_TYPE:
       JSMapIterator::cast(this)->JSMapIteratorVerify();
       break;
+    case JS_ITERATOR_RESULT_TYPE:
+      JSIteratorResult::cast(this)->JSIteratorResultVerify();
+      break;
     case JS_WEAK_MAP_TYPE:
       JSWeakMap::cast(this)->JSWeakMapVerify();
       break;
     case JS_WEAK_SET_TYPE:
       JSWeakSet::cast(this)->JSWeakSetVerify();
       break;
     case JS_REGEXP_TYPE:
       JSRegExp::cast(this)->JSRegExpVerify();
       break;
     case FILLER_TYPE:
@@ skipping 576 matching lines @@
 void JSMapIterator::JSMapIteratorVerify() {
   CHECK(IsJSMapIterator());
   JSObjectVerify();
   VerifyHeapPointer(table());
   CHECK(table()->IsOrderedHashTable() || table()->IsUndefined());
   CHECK(index()->IsSmi() || index()->IsUndefined());
   CHECK(kind()->IsSmi() || kind()->IsUndefined());
 }
 
 
+void JSIteratorResult::JSIteratorResultVerify() {
+  CHECK(IsJSIteratorResult());
+  JSObjectVerify();
+  VerifyPointer(done());
+  VerifyPointer(value());
+}
+
+
 void JSWeakMap::JSWeakMapVerify() {
   CHECK(IsJSWeakMap());
   JSObjectVerify();
   VerifyHeapPointer(table());
   CHECK(table()->IsHashTable() || table()->IsUndefined());
 }
 
 
 void JSWeakSet::JSWeakSetVerify() {
   CHECK(IsJSWeakSet());
@@ skipping 563 matching lines @@
 
   // Both are done at the same time.
   CHECK_EQ(new_it.done(), old_it.done());
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8