Use WeakCells in the optimized code map rather than traversing in pause.

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 9232d0e69aaf9b753f7a31df0e33cf7a954e69ee..afbe7ca2e481735a92eb9e3af87bc57e48e7f8e8 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -681,11 +681,6 @@ class MarkCompactCollector {
   void ProcessAndClearWeakCells();
   void AbortWeakCells();
 
-  // After all reachable objects have been marked, those entries within
-  // optimized code maps that became unreachable are removed, potentially
-  // trimming or clearing out the entire optimized code map.
-  void ProcessAndClearOptimizedCodeMaps();
-
   // Process non-live references in maps and optimized code.
   void ProcessWeakReferences();