Fix for 3303 MultithreadedParallelIsolates has a race condition.

src/arm64/builtins-arm64.cc

Index: src/arm64/builtins-arm64.cc
diff --git a/src/arm64/builtins-arm64.cc b/src/arm64/builtins-arm64.cc
index 2aed6b3bd86a402ec2f139af7be825ad053bab8d..fec5fef99af8b7559b8669ac774b69ed7f034cf0 100644
--- a/src/arm64/builtins-arm64.cc
+++ b/src/arm64/builtins-arm64.cc
@@ -887,7 +887,7 @@ void Builtins::Generate_MarkCodeAsExecutedOnce(MacroAssembler* masm) {
   }
 
   // Jump to point after the code-age stub.
-  __ Add(x0, x0, kCodeAgeSequenceSize);
+  __ Add(x0, x0, kNoCodeAgeSequenceLength);
   __ Br(x0);
 }