for-of should throw if result object is not an object

src/runtime/runtime-internal.cc

Index: src/runtime/runtime-internal.cc
diff --git a/src/runtime/runtime-internal.cc b/src/runtime/runtime-internal.cc
index 50b61921f59ed8916841e8a4edfd404a3b66208d..33234cd19f73b7b582a201a6c9158f349376ca36 100644
--- a/src/runtime/runtime-internal.cc
+++ b/src/runtime/runtime-internal.cc
@@ -55,6 +55,16 @@ RUNTIME_FUNCTION(Runtime_ThrowReferenceError) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_ThrowIteratorResultNotAnObject) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(Object, value, 0);
+  THROW_NEW_ERROR_RETURN_FAILURE(
+      isolate,
+      NewTypeError("iterator_result_not_an_object", HandleVector(&value, 1)));
+}
+
+
 RUNTIME_FUNCTION(Runtime_PromiseRejectEvent) {
   DCHECK(args.length() == 3);
   HandleScope scope(isolate);