Create and cache method extraction stub in the ICData.

runtime/vm/class_finalizer.cc

Index: runtime/vm/class_finalizer.cc
diff --git a/runtime/vm/class_finalizer.cc b/runtime/vm/class_finalizer.cc
index 0d1e4962b28cfc53aeb57cff31b412bbcc4e7cae..36e79a4f4ed2bbcc3f5f52d4652f7c7b01c3778d 100644
--- a/runtime/vm/class_finalizer.cc
+++ b/runtime/vm/class_finalizer.cc
@@ -915,7 +915,9 @@ static RawClass* FindSuperOwnerOfFunction(const Class& cls,
   super_class = cls.SuperClass();
   while (!super_class.IsNull()) {
     function = super_class.LookupFunction(name);
-    if (!function.IsNull() && !function.is_static()) {
+    if (!function.IsNull() &&
+        !function.is_static() &&
+        !function.IsMethodExtractor()) {
       return super_class.raw();
     }
     super_class = super_class.SuperClass();