Remove custom weak handling of monomorphic IC.

src/heap/mark-compact.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HEAP_MARK_COMPACT_H_
 #define V8_HEAP_MARK_COMPACT_H_
 
 #include "src/base/bits.h"
 #include "src/heap/spaces.h"
 
@@ skipping 790 matching lines @@
   void ClearNonLiveReferences();
   void ClearNonLivePrototypeTransitions(Map* map);
   void ClearNonLiveMapTransitions(Map* map, MarkBit map_mark);
   void ClearMapTransitions(Map* map);
   bool ClearMapBackPointer(Map* map);
   void TrimDescriptorArray(Map* map, DescriptorArray* descriptors,
                            int number_of_own_descriptors);
   void TrimEnumCache(Map* map, DescriptorArray* descriptors);
 
   void ClearDependentCode(DependentCode* dependent_code);
-  void ClearDependentICList(Object* head);
   void ClearNonLiveDependentCode(DependentCode* dependent_code);
   int ClearNonLiveDependentCodeInGroup(DependentCode* dependent_code, int group,
                                        int start, int end, int new_start);
 
   // Mark all values associated with reachable keys in weak collections
   // encountered so far.  This might push new object or even new weak maps onto
   // the marking stack.
   void ProcessWeakCollections();
 
   // After all reachable objects have been marked those weak map entries
@@ skipping 131 matching lines @@
  private:
   MarkCompactCollector* collector_;
 };
 
 
 const char* AllocationSpaceName(AllocationSpace space);
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_MARK_COMPACT_H_