[builtins] implement Array.prototype[@@iterator] in TFJ builtins

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 40cda3140eb36ba54872c3d6a213b00b497acb28..a7aa088034ddd4f2dfae98089cc5b0e2582bfca2 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -690,6 +690,12 @@ bool HeapObject::IsJSObject() const {
 
 bool HeapObject::IsJSProxy() const { return map()->IsJSProxyMap(); }
 
+bool HeapObject::IsJSArrayIterator() const {
+  InstanceType instance_type = map()->instance_type();
+  return (instance_type >= FIRST_ARRAY_ITERATOR_TYPE &&
+          instance_type <= LAST_ARRAY_ITERATOR_TYPE);
+}
+
 TYPE_CHECKER(JSSet, JS_SET_TYPE)
 TYPE_CHECKER(JSMap, JS_MAP_TYPE)
 TYPE_CHECKER(JSSetIterator, JS_SET_ITERATOR_TYPE)
@@ -3338,6 +3344,7 @@ CAST_ACCESSOR(JSRegExp)
 CAST_ACCESSOR(JSSet)
 CAST_ACCESSOR(JSSetIterator)
 CAST_ACCESSOR(JSStringIterator)
+CAST_ACCESSOR(JSArrayIterator)
 CAST_ACCESSOR(JSTypedArray)
 CAST_ACCESSOR(JSValue)
 CAST_ACCESSOR(JSWeakCollection)
@@ -8352,6 +8359,10 @@ static inline Handle<Object> MakeEntryPair(Isolate* isolate, Handle<Name> key,
 ACCESSORS(JSIteratorResult, value, Object, kValueOffset)
 ACCESSORS(JSIteratorResult, done, Object, kDoneOffset)
 
+ACCESSORS(JSArrayIterator, object, Object, kIteratedObjectOffset)
+ACCESSORS(JSArrayIterator, index, Object, kNextIndexOffset)
+ACCESSORS(JSArrayIterator, object_map, Map, kIteratedObjectMapOffset)
+
 ACCESSORS(JSStringIterator, string, String, kStringOffset)
 SMI_ACCESSORS(JSStringIterator, index, kNextIndexOffset)