Get rid of the NONEXISTENT PropertyType

src/lookup.cc

 // Copyright 2014 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/bootstrapper.h"
 #include "src/deoptimizer.h"
 #include "src/lookup.h"
 #include "src/lookup-inl.h"
@@ skipping 82 matching lines @@
   switch (property_details_.type()) {
     case v8::internal::FIELD:
     case v8::internal::NORMAL:
     case v8::internal::CONSTANT:
       property_kind_ = DATA;
       break;
     case v8::internal::CALLBACKS:
       property_kind_ = ACCESSOR;
       break;
     case v8::internal::HANDLER:
-    case v8::internal::NONEXISTENT:
     case v8::internal::INTERCEPTOR:
       UNREACHABLE();
   }
 
   has_property_ = true;
   return true;
 }
 
 
 void LookupIterator::ReloadPropertyInformation() {
@@ skipping 233 matching lines @@
     DCHECK_EQ(v8::internal::CONSTANT, property_details_.type());
   }
 }
 
 
 void LookupIterator::InternalizeName() {
   if (name_->IsUniqueName()) return;
   name_ = factory()->InternalizeString(Handle<String>::cast(name_));
 }
 } }  // namespace v8::internal