Fix for 3303 MultithreadedParallelIsolates has a race condition.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 4be51840ec9260a0efa6f6f018e49eb392656521..890ed81d5358faedb22054b445a1348bce40fe64 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5626,7 +5626,7 @@ class Code: public HeapObject {
   static void MakeCodeAgeSequenceYoung(byte* sequence, Isolate* isolate);
   static void MarkCodeAsExecuted(byte* sequence, Isolate* isolate);
   void MakeOlder(MarkingParity);
-  static bool IsYoungSequence(byte* sequence);
+  static bool IsYoungSequence(Isolate* isolate, byte* sequence);
   bool IsOld();
   Age GetAge();
   // Gets the raw code age, including psuedo code-age values such as
@@ -5788,7 +5788,7 @@ class Code: public HeapObject {
   byte* FindCodeAgeSequence();
   static void GetCodeAgeAndParity(Code* code, Age* age,
                                   MarkingParity* parity);
-  static void GetCodeAgeAndParity(byte* sequence, Age* age,
+  static void GetCodeAgeAndParity(Isolate* isolate, byte* sequence, Age* age,
                                   MarkingParity* parity);
   static Code* GetCodeAgeStub(Isolate* isolate, Age age, MarkingParity parity);