Implemented function that returns code age.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 1ee31b6dee9c58f8a9c41b36c6210577ebf75bca..f7a722b2248a6330bb7eda3d8d3e8d2ad226b82c 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4825,6 +4825,7 @@ class Code: public HeapObject {
   void MakeOlder(MarkingParity);
   static bool IsYoungSequence(byte* sequence);
   bool IsOld();
+  int GetAge();
 
   void PrintDeoptLocation(int bailout_id);
 
@@ -4966,8 +4967,8 @@ class Code: public HeapObject {
 
   // Code aging
   byte* FindCodeAgeSequence();
-  static void  GetCodeAgeAndParity(Code* code, Age* age,
-                                   MarkingParity* parity);
+  static void GetCodeAgeAndParity(Code* code, Age* age,
+                                  MarkingParity* parity);
   static void GetCodeAgeAndParity(byte* sequence, Age* age,
                                   MarkingParity* parity);
   static Code* GetCodeAgeStub(Age age, MarkingParity parity);