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

src/heap/spaces-inl.h

Index: src/heap/spaces-inl.h
diff --git a/src/heap/spaces-inl.h b/src/heap/spaces-inl.h
index f9e40bb13a805d80eb8c5b643e35fe795badda47..8bed9452354a50928318b809fb87320c9cd8413b 100644
--- a/src/heap/spaces-inl.h
+++ b/src/heap/spaces-inl.h
@@ -404,9 +404,8 @@ void Page::ClearEvacuationCandidate() {
   InitializeFreeListCategories();
 }
 
-MemoryChunkIterator::MemoryChunkIterator(Heap* heap, Mode mode)
+MemoryChunkIterator::MemoryChunkIterator(Heap* heap)
     : state_(kOldSpaceState),
-      mode_(mode),
       old_iterator_(heap->old_space()),
       code_iterator_(heap->code_space()),
       map_iterator_(heap->map_space()),
@@ -422,14 +421,14 @@ MemoryChunk* MemoryChunkIterator::next() {
       // Fall through.
     }
     case kMapState: {
-      if (mode_ != ALL_BUT_MAP_SPACE && map_iterator_.has_next()) {
+      if (map_iterator_.has_next()) {
         return map_iterator_.next();
       }
       state_ = kCodeState;
       // Fall through.
     }
     case kCodeState: {
-      if (mode_ != ALL_BUT_CODE_SPACE && code_iterator_.has_next()) {
+      if (code_iterator_.has_next()) {
         return code_iterator_.next();
       }
       state_ = kLargeObjectState;