| Index: src/property.h
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| diff --git a/src/property.h b/src/property.h
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| index f853fc8ba035519cbcbfe1288a0027ee3cc91e8e..5bb2c4d87a7e9d64f83a0e2034158dc34a70b783 100644
 | 
| --- a/src/property.h
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| +++ b/src/property.h
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| @@ -392,6 +392,11 @@ class LookupResult BASE_EMBEDDED {
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|      return IsTransition() && GetTransitionDetails(map).type() == FIELD;
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|    }
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|  
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| +  bool IsTransitionToConstantFunction(Map* map) {
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| +    return IsTransition() &&
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| +        GetTransitionDetails(map).type() == CONSTANT_FUNCTION;
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| +  }
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| +
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|    Map* GetTransitionMap() {
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|      ASSERT(IsTransition());
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|      return Map::cast(GetValue());
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| 
 |