Use first hit when dumping heap constants.

tools/v8heapconst.py

 # Copyright 2013 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 190 matching lines @@
   0x08d01: (165, "TypeFeedbackInfoMap"),
   0x08d29: (166, "AliasedArgumentsEntryMap"),
   0x08d51: (168, "DebugInfoMap"),
   0x08d79: (169, "BreakPointInfoMap"),
 }
 
 # List of known V8 objects.
 KNOWN_OBJECTS = {
   ("OLD_POINTER_SPACE", 0x08081): "NullValue",
   ("OLD_POINTER_SPACE", 0x08091): "UndefinedValue",
-  ("OLD_POINTER_SPACE", 0x080a1): "InstanceofCacheMap",
+  ("OLD_POINTER_SPACE", 0x080a1): "TheHoleValue",
   ("OLD_POINTER_SPACE", 0x080b1): "TrueValue",
   ("OLD_POINTER_SPACE", 0x080c1): "FalseValue",
   ("OLD_POINTER_SPACE", 0x080d1): "UninitializedValue",
   ("OLD_POINTER_SPACE", 0x080e1): "NoInterceptorResultSentinel",
   ("OLD_POINTER_SPACE", 0x080f1): "ArgumentsMarker",
   ("OLD_POINTER_SPACE", 0x08101): "NumberStringCache",
   ("OLD_POINTER_SPACE", 0x08909): "SingleCharacterStringCache",
   ("OLD_POINTER_SPACE", 0x08d11): "StringSplitCache",
   ("OLD_POINTER_SPACE", 0x09119): "RegExpMultipleCache",
   ("OLD_POINTER_SPACE", 0x09521): "TerminationException",
   ("OLD_POINTER_SPACE", 0x09531): "MessageListeners",
   ("OLD_POINTER_SPACE", 0x0954d): "CodeStubs",
   ("OLD_POINTER_SPACE", 0x0a9d9): "NonMonomorphicCache",
   ("OLD_POINTER_SPACE", 0x0afed): "PolymorphicCodeCache",
   ("OLD_POINTER_SPACE", 0x0aff5): "NativesSourceCache",
   ("OLD_POINTER_SPACE", 0x0b035): "EmptyScript",
   ("OLD_POINTER_SPACE", 0x0b06d): "IntrinsicFunctionNames",
   ("OLD_POINTER_SPACE", 0x0e089): "ObservationState",
   ("OLD_POINTER_SPACE", 0x0e095): "FrozenSymbol",
   ("OLD_POINTER_SPACE", 0x0e0a1): "ElementsTransitionSymbol",
   ("OLD_POINTER_SPACE", 0x0e0ad): "EmptySlowElementDictionary",
   ("OLD_POINTER_SPACE", 0x0e249): "ObservedSymbol",
-  ("OLD_POINTER_SPACE", 0x27631): "StringTable",
+  ("OLD_POINTER_SPACE", 0x27585): "StringTable",
   ("OLD_DATA_SPACE", 0x08099): "EmptyDescriptorArray",
   ("OLD_DATA_SPACE", 0x080a1): "EmptyFixedArray",
   ("OLD_DATA_SPACE", 0x080a9): "NanValue",
   ("OLD_DATA_SPACE", 0x08141): "EmptyByteArray",
   ("OLD_DATA_SPACE", 0x08269): "EmptyExternalByteArray",
   ("OLD_DATA_SPACE", 0x08275): "EmptyExternalUnsignedByteArray",
   ("OLD_DATA_SPACE", 0x08281): "EmptyExternalShortArray",
   ("OLD_DATA_SPACE", 0x0828d): "EmptyExternalUnsignedShortArray",
   ("OLD_DATA_SPACE", 0x08299): "EmptyExternalIntArray",
   ("OLD_DATA_SPACE", 0x082a5): "EmptyExternalUnsignedIntArray",
   ("OLD_DATA_SPACE", 0x082b1): "EmptyExternalFloatArray",
   ("OLD_DATA_SPACE", 0x082bd): "EmptyExternalDoubleArray",
   ("OLD_DATA_SPACE", 0x082c9): "EmptyExternalPixelArray",
   ("OLD_DATA_SPACE", 0x082d5): "InfinityValue",
   ("OLD_DATA_SPACE", 0x082e1): "MinusZeroValue",
-  ("CODE_SPACE", 0x0e801): "JsConstructEntryCode",
-  ("CODE_SPACE", 0x176e1): "JsEntryCode",
+  ("CODE_SPACE", 0x0eb41): "JsConstructEntryCode",
+  ("CODE_SPACE", 0x177a1): "JsEntryCode",
 }