Fix corner case in optimized code map zapping.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5811 matching lines @@
 
   // Clear optimized code map.
   void ClearOptimizedCodeMap();
 
   // Removed a specific optimized code object from the optimized code map.
   void EvictFromOptimizedCodeMap(Code* optimized_code, const char* reason);
 
   // Trims the optimized code map after entries have been removed.
   void TrimOptimizedCodeMap(int shrink_by);
 
-  // Zaps the contents of backing optimized code map.
-  void ZapOptimizedCodeMap();
-
   // Add a new entry to the optimized code map.
   MUST_USE_RESULT MaybeObject* AddToOptimizedCodeMap(Context* native_context,
                                                      Code* code,
                                                      FixedArray* literals);
   static void AddToOptimizedCodeMap(Handle<SharedFunctionInfo> shared,
                                     Handle<Context> native_context,
                                     Handle<Code> code,
                                     Handle<FixedArray> literals);
 
   // Layout description of the optimized code map.
@@ skipping 3764 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_