[heap] Move typed slot filtering logic into sweeper.

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index d78d621cda40447408cab4ec260ecbdf0a8f37a3..5e0a7a86a2aa3751a179ae732f090c63c9a705d1 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -527,7 +527,6 @@ MemoryChunk* MemoryChunk::Initialize(Heap* heap, Address base, size_t size,
   chunk->set_next_chunk(nullptr);
   chunk->set_prev_chunk(nullptr);
   chunk->local_tracker_ = nullptr;
-  chunk->black_area_end_marker_map_ = nullptr;
 
   DCHECK(OFFSET_OF(MemoryChunk, flags_) == kFlagsOffset);
 
@@ -1385,12 +1384,6 @@ void PagedSpace::EmptyAllocationInfo() {
 
   if (heap()->incremental_marking()->black_allocation()) {
     Page* page = Page::FromAllocationAreaAddress(current_top);
-    // We have to remember the end of the current black allocation area if
-    // something was allocated in the current bump pointer range.
-    if (allocation_info_.original_top() != current_top) {
-      Address end_black_area = current_top - kPointerSize;
-      page->AddBlackAreaEndMarker(end_black_area);
-    }
 
     // Clear the bits in the unused black area.
     if (current_top != current_limit) {
@@ -1416,8 +1409,6 @@ void PagedSpace::ReleasePage(Page* page) {
   free_list_.EvictFreeListItems(page);
   DCHECK(!free_list_.ContainsPageFreeListItems(page));
 
-  page->ReleaseBlackAreaEndMarkerMap();
-
   if (Page::FromAllocationAreaAddress(allocation_info_.top()) == page) {
     allocation_info_.Reset(nullptr, nullptr);
   }