Prevent flushing of code that was set with %SetCode.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index dd77c14e3f9239ca678ca0b2282033f09ee5a312..c162b4612d458bc2f962bd5cb611757e3f03da3e 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -455,9 +455,8 @@ Handle<JSFunction> Genesis::CreateEmptyFunction(Isolate* isolate) {
   function_map_writable_prototype_ = CreateFunctionMap(ADD_WRITEABLE_PROTOTYPE);
 
   Factory* factory = isolate->factory();
-  Heap* heap = isolate->heap();
 
-  Handle<String> object_name = Handle<String>(heap->Object_string());
+  Handle<String> object_name = factory->Object_string();
 
   {  // --- O b j e c t ---
     Handle<JSFunction> object_fun =
@@ -830,7 +829,7 @@ bool Genesis::InitializeGlobal(Handle<GlobalObject> inner_global,
   Factory* factory = isolate->factory();
   Heap* heap = isolate->heap();
 
-  Handle<String> object_name = Handle<String>(heap->Object_string());
+  Handle<String> object_name = factory->Object_string();
   CHECK_NOT_EMPTY_HANDLE(isolate,
                          JSObject::SetLocalPropertyIgnoreAttributes(
                              inner_global, object_name,