add a default value for return value

src/arguments.h

Index: src/arguments.h
diff --git a/src/arguments.h b/src/arguments.h
index e13ddc9ec83f0f69e1bdb53d00a18ca9b5522310..b2608e56cc0fe2ab7211ca475decc7c7c8d18f1f 100644
--- a/src/arguments.h
+++ b/src/arguments.h
@@ -253,6 +253,10 @@ class PropertyCallbackArguments
     values[T::kHolderIndex] = holder;
     values[T::kDataIndex] = data;
     values[T::kIsolateIndex] = reinterpret_cast<Object*>(isolate);
+    // Here the hole is set as default value.
+    // It cannot escape into js as it's remove in Call below.
+    values[T::kReturnValueDefaultValueIndex] =
+        isolate->heap()->the_hole_value();
     values[T::kReturnValueIndex] = isolate->heap()->the_hole_value();
     ASSERT(values[T::kHolderIndex]->IsHeapObject());
     ASSERT(values[T::kIsolateIndex]->IsSmi());
@@ -313,6 +317,10 @@ class FunctionCallbackArguments
     values[T::kCalleeIndex] = callee;
     values[T::kHolderIndex] = holder;
     values[T::kIsolateIndex] = reinterpret_cast<internal::Object*>(isolate);
+    // Here the hole is set as default value.
+    // It cannot escape into js as it's remove in Call below.
+    values[T::kReturnValueDefaultValueIndex] =
+        isolate->heap()->the_hole_value();
     values[T::kReturnValueIndex] = isolate->heap()->the_hole_value();
     ASSERT(values[T::kCalleeIndex]->IsJSFunction());
     ASSERT(values[T::kHolderIndex]->IsHeapObject());