Fix for 3303 MultithreadedParallelIsolates has a race condition.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include "allocation.h"
 #include "assert-scope.h"
 #include "builtins.h"
@@ skipping 5608 matching lines @@
   };
 #undef DECLARE_CODE_AGE_ENUM
 
   // Code aging.  Indicates how many full GCs this code has survived without
   // being entered through the prologue.  Used to determine when it is
   // relatively safe to flush this code object and replace it with the lazy
   // compilation stub.
   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
   // kNotExecutedCodeAge and kExecutedOnceCodeAge.
   Age GetRawAge();
   static inline Code* GetPreAgedCodeAgeStub(Isolate* isolate) {
     return GetCodeAgeStub(isolate, kNotExecutedCodeAge, NO_MARKING_PARITY);
   }
 
   void PrintDeoptLocation(FILE* out, int bailout_id);
@@ skipping 141 matching lines @@
  private:
   friend class RelocIterator;
   friend class Deoptimizer;  // For FindCodeAgeSequence.
 
   void ClearInlineCaches(Kind* kind);
 
   // Code aging
   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);
 
   // Code aging -- platform-specific
   static void PatchPlatformCodeAge(Isolate* isolate,
                                    byte* sequence, Age age,
                                    MarkingParity parity);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(Code);
 };
@@ skipping 5305 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_