Fix for 3303 MultithreadedParallelIsolates has a race condition.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 6f306408908eac1caf81d1606364b2ee13224110..2a594ceab73d2c651776fff727465d9530ea3e36 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -11260,10 +11260,11 @@ void Code::MakeOlder(MarkingParity current_parity) {
   if (sequence != NULL) {
     Age age;
     MarkingParity code_parity;
-    GetCodeAgeAndParity(sequence, &age, &code_parity);
+    Isolate* isolate = GetIsolate();
+    GetCodeAgeAndParity(isolate, sequence, &age, &code_parity);
     age = EffectiveAge(age);
     if (age != kLastCodeAge && code_parity != current_parity) {
-      PatchPlatformCodeAge(GetIsolate(),
+      PatchPlatformCodeAge(isolate,
                            sequence,
                            static_cast<Age>(age + 1),
                            current_parity);
@@ -11299,7 +11300,7 @@ Code::Age Code::GetRawAge() {
   }
   Age age;
   MarkingParity parity;
-  GetCodeAgeAndParity(sequence, &age, &parity);
+  GetCodeAgeAndParity(GetIsolate(), sequence, &age, &parity);
   return age;
 }