[builtins] implement JSBuiltinReducer for ArrayIteratorNext()

src/compiler/js-operator.h

Index: src/compiler/js-operator.h
diff --git a/src/compiler/js-operator.h b/src/compiler/js-operator.h
index 0983d55d298d93e6ffe48f363696aee37d5a0464..7e22add474593f494a0961e8f5bf3a69791ed779 100644
--- a/src/compiler/js-operator.h
+++ b/src/compiler/js-operator.h
@@ -458,6 +458,7 @@ class V8_EXPORT_PRIVATE JSOperatorBuilder final
   const Operator* CreateClosure(Handle<SharedFunctionInfo> shared_info,
                                 PretenureFlag pretenure);
   const Operator* CreateIterResultObject();
+  const Operator* CreateKeyValueArray();
   const Operator* CreateLiteralArray(Handle<FixedArray> constant_elements,
                                      int literal_flags, int literal_index,
                                      int number_of_elements);