[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index b3f72d5f9c817a510dd42e08c2e766b5f1619299..c7e9cf3c9241efdb05e38f4127e41feb47b840d8 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -925,6 +925,17 @@ RUNTIME_FUNCTION(Runtime_CreateIterResultObject) {
   return *isolate->factory()->NewJSIteratorResult(value, done->BooleanValue());
 }
 
+RUNTIME_FUNCTION(Runtime_CreateKeyValueArray) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(2, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(Object, key, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 1);
+  Handle<FixedArray> elements = isolate->factory()->NewFixedArray(2);
+  elements->set(0, *key);
+  elements->set(1, *value);
+  return *isolate->factory()->NewJSArrayWithElements(elements, FAST_ELEMENTS,
+                                                     2);
+}
 
 RUNTIME_FUNCTION(Runtime_IsAccessCheckNeeded) {
   SealHandleScope shs(isolate);