Fix for 3303 MultithreadedParallelIsolates has a race condition.

src/arm64/builtins-arm64.cc

 // Copyright 2013 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.
 
 #include "v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "codegen.h"
 #include "debug.h"
@@ skipping 869 matching lines @@
     __ CallCFunction(
         ExternalReference::get_mark_code_as_executed_function(
             masm->isolate()), 2);
     __ Pop(lr, fp, x1, x0);
 
     // Perform prologue operations usually performed by the young code stub.
     __ EmitFrameSetupForCodeAgePatching(masm);
   }
 
   // Jump to point after the code-age stub.
-  __ Add(x0, x0, kCodeAgeSequenceSize);
+  __ Add(x0, x0, kNoCodeAgeSequenceLength);
   __ Br(x0);
 }
 
 
 void Builtins::Generate_MarkCodeAsExecutedTwice(MacroAssembler* masm) {
   GenerateMakeCodeYoungAgainCommon(masm);
 }
 
 
 static void Generate_NotifyStubFailureHelper(MacroAssembler* masm,
@@ skipping 659 matching lines @@
     __ Unreachable();
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM