Perform RegisterReservationsForBlackAllocation atomically with deserialization of code.

src/snapshot/deserializer.cc

Index: src/snapshot/deserializer.cc
diff --git a/src/snapshot/deserializer.cc b/src/snapshot/deserializer.cc
index 1a94881087ee32ad57fe3e59e50847a3146b5ddb..90f77153253f02fa11afa91cbbd17897e87d46d2 100644
--- a/src/snapshot/deserializer.cc
+++ b/src/snapshot/deserializer.cc
@@ -157,9 +157,9 @@ MaybeHandle<SharedFunctionInfo> Deserializer::DeserializeCode(
       DeserializeDeferredObjects();
       FlushICacheForNewCodeObjects();
       result = Handle<SharedFunctionInfo>(SharedFunctionInfo::cast(root));
+      isolate->heap()->RegisterReservationsForBlackAllocation(reservations_);
     }
     CommitPostProcessedObjects(isolate);
-    isolate->heap()->RegisterReservationsForBlackAllocation(reservations_);
     return scope.CloseAndEscape(result);
   }
 }