Re-enable parallel pointer updates.

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index 2c998c8817a090478f0e209881aaad04efde6e61..38b8167d0d577560bac21ecbe3f70f0297dcb55c 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -3585,14 +3585,16 @@ int NumberOfPointerUpdateTasks(int pages) {
 
 template <PointerDirection direction>
 void UpdatePointersInParallel(Heap* heap) {
-  PageParallelJob<PointerUpdateJobTraits<direction> > job(
-      heap, heap->isolate()->cancelable_task_manager());
+  PageParallelJob<PointerUpdateJobTraits<direction> >* job =
+      new PageParallelJob<PointerUpdateJobTraits<direction> >(
+          heap, heap->isolate()->cancelable_task_manager());
   RememberedSet<direction>::IterateMemoryChunks(
-      heap, [&job](MemoryChunk* chunk) { job.AddPage(chunk, 0); });
+      heap, [job](MemoryChunk* chunk) { job->AddPage(chunk, 0); });
   PointersUpdatingVisitor visitor(heap);
-  int num_pages = job.NumberOfPages();
+  int num_pages = job->NumberOfPages();
   int num_tasks = NumberOfPointerUpdateTasks(num_pages);
-  job.Run(num_tasks, [&visitor](int i) { return &visitor; });
+  job->Run(num_tasks, [&visitor](int i) { return &visitor; });
+  delete job;
 }
 
 void MarkCompactCollector::UpdatePointersAfterEvacuation() {