Calling a generator function returns a generator object

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 7288f38171eb75f6c4e15106817249b4b0b950fe..f1907e0d3d629e864f6ddd10f1e577b73f151993 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -2292,6 +2292,15 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_SetExpectedNumberOfProperties) {
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, Runtime_CreateJSGeneratorObject) {
+  NoHandleAllocation ha(isolate);
+  ASSERT(args.length() == 1);
+  CONVERT_ARG_CHECKED(JSFunction, function, 0);
+  ASSERT(function->shared()->is_generator());
+  return isolate->heap()->AllocateJSGeneratorObject(function);
+}
+
+
 MUST_USE_RESULT static MaybeObject* CharFromCode(Isolate* isolate,
                                                  Object* char_code) {
   uint32_t code;