[heap] Introduce a new remembered set for typed pointers from old to new.

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index 9a7b8a5f2767766c7a2338e96f0ac5ffebfe2be3..aa30e7da3b438102f3b7980b85f6e4e93ea116e0 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -509,6 +509,7 @@ class MemoryChunk {
   static const size_t kWriteBarrierCounterOffset =
       kOldToNewSlotsOffset + kPointerSize  // SlotSet* old_to_new_slots_;
       + kPointerSize                       // SlotSet* old_to_old_slots_;
+      + kPointerSize   // TypedSlotSet* typed_old_to_new_slots_;
       + kPointerSize   // TypedSlotSet* typed_old_to_old_slots_;
       + kPointerSize;  // SkipList* skip_list_;
 
@@ -625,6 +626,9 @@ class MemoryChunk {
 
   inline SlotSet* old_to_new_slots() { return old_to_new_slots_; }
   inline SlotSet* old_to_old_slots() { return old_to_old_slots_; }
+  inline TypedSlotSet* typed_old_to_new_slots() {
+    return typed_old_to_new_slots_;
+  }
   inline TypedSlotSet* typed_old_to_old_slots() {
     return typed_old_to_old_slots_;
   }
@@ -633,6 +637,8 @@ class MemoryChunk {
   void ReleaseOldToNewSlots();
   void AllocateOldToOldSlots();
   void ReleaseOldToOldSlots();
+  void AllocateTypedOldToNewSlots();
+  void ReleaseTypedOldToNewSlots();
   void AllocateTypedOldToOldSlots();
   void ReleaseTypedOldToOldSlots();
 
@@ -792,6 +798,7 @@ class MemoryChunk {
   // is ceil(size() / kPageSize).
   SlotSet* old_to_new_slots_;
   SlotSet* old_to_old_slots_;
+  TypedSlotSet* typed_old_to_new_slots_;
   TypedSlotSet* typed_old_to_old_slots_;
 
   SkipList* skip_list_;
@@ -3111,8 +3118,7 @@ class LargePageIterator BASE_EMBEDDED {
 // pointers to new space or to evacuation candidates.
 class MemoryChunkIterator BASE_EMBEDDED {
  public:
-  enum Mode { ALL, ALL_BUT_MAP_SPACE, ALL_BUT_CODE_SPACE };
-  inline explicit MemoryChunkIterator(Heap* heap, Mode mode);
+  inline explicit MemoryChunkIterator(Heap* heap);
 
   // Return NULL when the iterator is done.
   inline MemoryChunk* next();
@@ -3126,7 +3132,6 @@ class MemoryChunkIterator BASE_EMBEDDED {
     kFinishedState
   };
   State state_;
-  const Mode mode_;
   PageIterator old_iterator_;
   PageIterator code_iterator_;
   PageIterator map_iterator_;