[heap] Move typed slot filtering logic into sweeper.

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index 19d72fc7d5e280456f6b1453bacb9634617a770d..67568a96e346f761d1897b57eac904b5122a3d5e 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -288,6 +288,11 @@ class MarkCompactCollector {
 
     enum FreeListRebuildingMode { REBUILD_FREE_LIST, IGNORE_FREE_LIST };
     enum FreeSpaceTreatmentMode { IGNORE_FREE_SPACE, ZAP_FREE_SPACE };
+    enum ClearOldToNewSlotsMode {
+      DO_NOT_CLEAR,
+      CLEAR_REGULAR_SLOTS,
+      CLEAR_TYPED_SLOTS
+    };
 
     typedef std::deque<Page*> SweepingList;
     typedef List<Page*> SweptList;
@@ -326,6 +331,8 @@ class MarkCompactCollector {
    private:
     static const int kAllocationSpaces = LAST_PAGED_SPACE + 1;
 
+    static ClearOldToNewSlotsMode GetClearOldToNewSlotsMode(Page* p);
+
     template <typename Callback>
     void ForAllSweepingSpaces(Callback callback) {
       for (int i = 0; i < kAllocationSpaces; i++) {
@@ -478,16 +485,6 @@ class MarkCompactCollector {
 
   void InitializeMarkingDeque();
 
-  // The following two methods can just be called after marking, when the
-  // whole transitive closure is known. They must be called before sweeping
-  // when mark bits are still intact.
-  bool IsSlotInBlackObject(MemoryChunk* p, Address slot);
-  HeapObject* FindBlackObjectBySlotSlow(Address slot);
-
-  // Removes all the slots in the slot buffers that are within the given
-  // address range.
-  void RemoveObjectSlots(Address start_slot, Address end_slot);
-
   Sweeper& sweeper() { return sweeper_; }
 
  private: