Implemented function that returns code age.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 6512c607799dd34fd71e69aa8e656681ff3f5e42..9651b91c4556ab6cede3c0227ffd6f3c22ae45f4 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -10299,6 +10299,18 @@ byte* Code::FindCodeAgeSequence() {
 }
 
 
+int Code::GetAge() {
+  byte* sequence = FindCodeAgeSequence();
+  if (sequence == NULL) {
+    return Code::kNoAge;
+  }
+  Age age;
+  MarkingParity parity;
+  GetCodeAgeAndParity(sequence, &age, &parity);
+  return age;
+}
+
+
 void Code::GetCodeAgeAndParity(Code* code, Age* age,
                                MarkingParity* parity) {
   Isolate* isolate = Isolate::Current();