Integrate map marking into static marking visitor.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 2ee1a2c475332be73970e3d271875b83f6610ab9..ed0aa242a48230ba2e6baf931539ff11a863720b 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -1489,13 +1489,6 @@ class Heap {
 
   void ClearNormalizedMapCaches();
 
-  // Clears the cache of ICs related to this map.
-  void ClearCacheOnMap(Map* map) {
-    if (FLAG_cleanup_code_caches_at_gc) {
-      map->ClearCodeCache(this);
-    }
-  }
-
   GCTracer* tracer() { return tracer_; }
 
   // Returns the size of objects residing in non new spaces.