Move the temporary private freelist closer to where it's used

src/sweeper-thread.cc

Index: src/sweeper-thread.cc
diff --git a/src/sweeper-thread.cc b/src/sweeper-thread.cc
index 6f3baed11f8f111d91e1caf6c61685b043489b7f..403c9ce511c1eb195b4e6d7020c1af547dccfe26 100644
--- a/src/sweeper-thread.cc
+++ b/src/sweeper-thread.cc
@@ -46,10 +46,7 @@ SweeperThread::SweeperThread(Isolate* isolate)
        end_sweeping_semaphore_(0),
        stop_semaphore_(0),
        free_list_old_data_space_(heap_->paged_space(OLD_DATA_SPACE)),
-       free_list_old_pointer_space_(heap_->paged_space(OLD_POINTER_SPACE)),
-       private_free_list_old_data_space_(heap_->paged_space(OLD_DATA_SPACE)),
-       private_free_list_old_pointer_space_(
-           heap_->paged_space(OLD_POINTER_SPACE)) {
+       free_list_old_pointer_space_(heap_->paged_space(OLD_POINTER_SPACE)) {
   NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(false));
 }
 
@@ -69,10 +66,8 @@ void SweeperThread::Run() {
     }
 
     collector_->SweepInParallel(heap_->old_data_space(),
-                                &private_free_list_old_data_space_,
                                 &free_list_old_data_space_);
     collector_->SweepInParallel(heap_->old_pointer_space(),
-                                &private_free_list_old_pointer_space_,
                                 &free_list_old_pointer_space_);
     end_sweeping_semaphore_.Signal();
   }