Add support for tracking NotExectuted/ExecutedOnceCodeAge's when --track_gc_object_stats flag is se…

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 267ef133abc43373b84b02fbd9c3e8e63b2ce85a..c9ce718acab731bb160c58640a19751b325ece22 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5304,8 +5304,9 @@ class Code: public HeapObject {
     kNoAgeCodeAge = 0,
     CODE_AGE_LIST(DECLARE_CODE_AGE_ENUM)
     kAfterLastCodeAge,
+    kFirstCodeAge = kNotExecutedCodeAge,
     kLastCodeAge = kAfterLastCodeAge - 1,
-    kCodeAgeCount = kAfterLastCodeAge - 1,
+    kCodeAgeCount = kAfterLastCodeAge - kNotExecutedCodeAge - 1,
     kIsOldCodeAge = kSexagenarianCodeAge,
     kPreAgedCodeAge = kIsOldCodeAge - 1
   };
@@ -5321,6 +5322,9 @@ class Code: public HeapObject {
   static bool IsYoungSequence(byte* sequence);
   bool IsOld();
   Age GetAge();
+  // Gets the raw code age, including psuedo code-age values such as
+  // kNotExecutedCodeAge and kExecutedOnceCodeAge.
+  Age GetRawAge();
   static inline Code* GetPreAgedCodeAgeStub(Isolate* isolate) {
     return GetCodeAgeStub(isolate, kNotExecutedCodeAge, NO_MARKING_PARITY);
   }