[heap] Reland "Remove black pages and use black areas instead."

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 4f5938abd5b2e7bd5337b48536b48dfc54b4abb5..dfe8bd6cf1b28a22a325e814be378c937f44e07a 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1995,10 +1995,9 @@ void WeakCell::initialize(HeapObject* val) {
   // We just have to execute the generational barrier here because we never
   // mark through a weak cell and collect evacuation candidates when we process
   // all weak cells.
-  WriteBarrierMode mode =
-      Page::FromAddress(this->address())->IsFlagSet(Page::BLACK_PAGE)
-          ? UPDATE_WRITE_BARRIER
-          : UPDATE_WEAK_WRITE_BARRIER;
+  WriteBarrierMode mode = Marking::IsBlack(ObjectMarking::MarkBitFrom(this))
+                              ? UPDATE_WRITE_BARRIER
+                              : UPDATE_WEAK_WRITE_BARRIER;
   CONDITIONAL_WRITE_BARRIER(GetHeap(), this, kValueOffset, val, mode);
 }