Switch UnreachableObjectsFilter to use Marking instead of InstrusiveMarking.

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index 2b933694b6a2c6f63f850b8cd0f019ec59e55708..f8de7e3d40dfb9f993317a064d2c53916aaa3d23 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -839,7 +839,10 @@ void PagedSpace::Verify(ObjectVisitor* visitor) {
       ASSERT(object->address() + size <= top);
       end_of_previous_object = object->address() + size;
     }
-    ASSERT_LE(black_size, page->LiveBytes());
+
+    if (!heap()->mark_compact_collector()->AreMarkbitsTainted()) {
+      ASSERT_LE(black_size, page->LiveBytes());
+    }
   }
   ASSERT(allocation_pointer_found_in_space);
 }