Correctly hook up back references to internalized strings in code deserializer.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 46787bf12039a96a1b92b389b0459952157ddd2f..629a951314d16f947d4908636f5ade363e433cfa 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -9310,6 +9310,11 @@ class String: public Name {
   static Handle<FixedArray> CalculateLineEnds(Handle<String> string,
                                               bool include_ending_line);
 
+  // Use the hash field to forward to the canonical internalized string
+  // when deserializing an internalized string.
+  inline void SetForwardedInternalizedString(String* string);
+  inline String* GetForwardedInternalizedString();
+
  private:
   friend class Name;
   friend class StringTableInsertionKey;