Do not use possibly stale values for cache size, etc.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index c136dc59b543de6ac30497d8f4a2776085cf47bd..9a577f142ecf4d71dfe884c02b7ddbb416846e5a 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2613,6 +2613,11 @@ class JSFunctionResultCache: public FixedArray {
   inline void MakeZeroSize();
   inline void Clear();
 
+  inline int size();
+  inline void set_size(int size);
+  inline int finger_index();
+  inline void set_finger_index(int finger_index);
+
   // Casting
   static inline JSFunctionResultCache* cast(Object* obj);