[heap] RecordWrites iterates black object to ensure marking progress.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index e9b67efbbc230724a16751e8baaeadd877c845fc..5275c31bad71e74c0ceda012047cc7fc8255b748 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -1108,7 +1108,7 @@ void Heap::MoveElements(FixedArray* array, int dst_index, int src_index,
                   dst_objects[i]);
     }
   }
-  incremental_marking()->RecordWrites(array);
+  incremental_marking()->IterateBlackObject(array);
 }
 
 
@@ -4708,10 +4708,9 @@ void Heap::IteratePromotedObject(HeapObject* target, int size,
   // regular visiting and IteratePromotedObjectPointers.
   if (!was_marked_black) {
     if (incremental_marking()->black_allocation()) {
-      Map* map = target->map();
-      IncrementalMarking::MarkObject(this, map);
+      IncrementalMarking::MarkObject(this, target->map());
+      incremental_marking()->IterateBlackObject(target);
     }
-    incremental_marking()->IterateBlackObject(target);
   }
 }