Optimize ClearNonLiveReferences: collect dependent code only from maps that are embedded in optimize

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index d0fb955d8bc7499a1cbbbbedc22fd4a406737275..c82d0cf934ddfbb14fc44ce9765e2208bbeb9947 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -627,6 +627,9 @@ class MarkCompactCollector {
   // increase chances of reusing of map transition tree in future.
   void RetainMaps();
 
+  // Collects a list of dependent code from maps embedded in optimize code.
+  DependentCode* DependentCodeListFromNonLiveMaps();
+
   // Mark objects reachable (transitively) from objects in the marking
   // stack.  This function empties the marking stack, but may leave
   // overflowed objects in the heap, in which case the marking stack's
@@ -657,6 +660,7 @@ class MarkCompactCollector {
   void ClearNonLiveMapTransitions(Map* map);
   void ClearMapTransitions(Map* map, Map* dead_transition);
   bool ClearMapBackPointer(Map* map);
+  void MarkDependentCodeListForDeoptimization(DependentCode* list_head);
   void TrimDescriptorArray(Map* map, DescriptorArray* descriptors,
                            int number_of_own_descriptors);
   void TrimEnumCache(Map* map, DescriptorArray* descriptors);
@@ -683,6 +687,9 @@ class MarkCompactCollector {
   // trimming or clearing out the entire optimized code map.
   void ProcessAndClearOptimizedCodeMaps();
 
+  // Process non-live references in maps and optimized code.
+  void ProcessWeakReferences();
+
   // -----------------------------------------------------------------------
   // Phase 2: Sweeping to clear mark bits and free non-live objects for
   // a non-compacting collection.