Fix function premable for native entrypoints.

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 64023dceafea56969aaee7bd4c30da8b8bab6aa6..fa9c9d382e4eed4d0a0551a0ed898d76d333e55a 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -14227,12 +14227,24 @@ void WeakProperty::PrintToJSONStream(JSONStream* stream, bool ref) const {
 }
 
 
+RawClass* MirrorReference::GetClassReferent() const {
+  ASSERT(Object::Handle(referent()).IsClass());
+  return Class::Cast(Object::Handle(referent())).raw();
+}
+
+
 RawFunction* MirrorReference::GetFunctionReferent() const {
   ASSERT(Object::Handle(referent()).IsFunction());
   return Function::Cast(Object::Handle(referent())).raw();
 }
 
 
+RawLibrary* MirrorReference::GetLibraryReferent() const {
+  ASSERT(Object::Handle(referent()).IsLibrary());
+  return Library::Cast(Object::Handle(referent())).raw();
+}
+
+
 RawMirrorReference* MirrorReference::New(Heap::Space space) {
   ASSERT(Isolate::Current()->object_store()->mirror_reference_class()
          != Class::null());