ES6: Add support for Map/Set forEach

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 40132cbf6b050f5da85ce18b2dcf02184f512615..d21e65e01eb155bc57113a97041507a8df223e74 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -170,6 +170,12 @@ void HeapObject::HeapObjectVerify() {
     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_WEAK_MAP_TYPE:
       JSWeakMap::cast(this)->JSWeakMapVerify();
       break;
@@ -711,6 +717,7 @@ void JSSet::JSSetVerify() {
   JSObjectVerify();
   VerifyHeapPointer(table());
   CHECK(table()->IsOrderedHashTable() || table()->IsUndefined());
+  // TODO(arv): Verify OrderedHashTable too.
 }
 
 
@@ -719,6 +726,39 @@ void JSMap::JSMapVerify() {
   JSObjectVerify();
   VerifyHeapPointer(table());
   CHECK(table()->IsOrderedHashTable() || table()->IsUndefined());
+  // TODO(arv): Verify OrderedHashTable too.
+}
+
+
+void JSSetIterator::JSSetIteratorVerify() {
+  CHECK(IsJSSetIterator());
+  JSObjectVerify();
+  VerifyHeapPointer(table());
+  CHECK(table()->IsOrderedHashTable() || table()->IsUndefined());
+  CHECK(index()->IsSmi());
+  CHECK(count()->IsSmi());
+  CHECK(kind()->IsSmi());
+  VerifyHeapPointer(next_iterator());
+  CHECK(next_iterator()->IsJSSetIterator() || next_iterator()->IsUndefined());
+  VerifyHeapPointer(table());
+  CHECK(previous_iterator()->IsJSSetIterator()
+        || previous_iterator()->IsUndefined());
+}
+
+
+void JSMapIterator::JSMapIteratorVerify() {
+  CHECK(IsJSMapIterator());
+  JSObjectVerify();
+  VerifyHeapPointer(table());
+  CHECK(table()->IsOrderedHashTable() || table()->IsUndefined());
+  CHECK(index()->IsSmi());
+  CHECK(count()->IsSmi());
+  CHECK(kind()->IsSmi());
+  VerifyHeapPointer(next_iterator());
+  CHECK(next_iterator()->IsJSMapIterator() || next_iterator()->IsUndefined());
+  VerifyHeapPointer(table());
+  CHECK(previous_iterator()->IsJSMapIterator()
+        || previous_iterator()->IsUndefined());
 }