Disable short-circuiting of cons-strings when compaction is pending.

src/objects-visiting.h

Index: src/objects-visiting.h
diff --git a/src/objects-visiting.h b/src/objects-visiting.h
index b8b1a251c4bd75e02fc003083a744a4f505ab21b..e6ddfed4a7d2ab04ccaf12ba69aeb1665125e0a7 100644
--- a/src/objects-visiting.h
+++ b/src/objects-visiting.h
@@ -157,6 +157,10 @@ class VisitorDispatchTable {
     }
   }
 
+  inline Callback GetVisitorById(StaticVisitorBase::VisitorId id) {
+    return reinterpret_cast<Callback>(callbacks_[id]);
+  }
+
   inline Callback GetVisitor(Map* map) {
     return reinterpret_cast<Callback>(callbacks_[map->visitor_id()]);
   }