Refactoring only: Extracted 2 methods from ClearNonLiveTransitions

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index 93f3fd254823dcad36fadc0d7eb507c0213bfa8e..a911b49d2ee25f46989221f968defc6da8c60c98 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -696,6 +696,8 @@ class MarkCompactCollector {
   // Map transitions from a live map to a dead map must be killed.
   // We replace them with a null descriptor, with the same key.
   void ClearNonLiveTransitions();
+  void ClearNonLivePrototypeTransitions(Map* map);
+  void ClearNonLiveMapTransitions(Map* map, MarkBit map_mark);
 
   // Marking detaches initial maps from SharedFunctionInfo objects
   // to make this reference weak. We need to reattach initial maps