Get rid of the NONEXISTENT PropertyType

src/heap-snapshot-generator.cc

 // Copyright 2013 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.
 
 #include "src/v8.h"
 
 #include "src/heap-snapshot-generator-inl.h"
 
 #include "src/allocation-tracker.h"
 #include "src/code-stubs.h"
@@ skipping 1682 matching lines @@
           break;
         case CALLBACKS:
           ExtractAccessorPairProperty(
               js_obj, entry,
               descs->GetKey(i), descs->GetValue(i));
           break;
         case NORMAL:  // only in slow mode
         case HANDLER:  // only in lookup results, not in descriptors
         case INTERCEPTOR:  // only in lookup results, not in descriptors
           break;
-        case NONEXISTENT:
-          UNREACHABLE();
-          break;
       }
     }
   } else {
     NameDictionary* dictionary = js_obj->property_dictionary();
     int length = dictionary->Capacity();
     for (int i = 0; i < length; ++i) {
       Object* k = dictionary->KeyAt(i);
       if (dictionary->IsKey(k)) {
         Object* target = dictionary->ValueAt(i);
         // We assume that global objects can only have slow properties.
@@ skipping 1451 matching lines @@
   writer_->AddString("\"<dummy>\"");
   for (int i = 1; i < sorted_strings.length(); ++i) {
     writer_->AddCharacter(',');
     SerializeString(sorted_strings[i]);
     if (writer_->aborted()) return;
   }
 }
 
 
 } }  // namespace v8::internal