handle the special snowflakes that are Integer Indexed Exotic objects

src/runtime/runtime-debug.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/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/debug.h"
@@ skipping 54 matching lines @@
 static Handle<Object> DebugGetProperty(LookupIterator* it,
                                        bool* has_caught = NULL) {
   for (; it->IsFound(); it->Next()) {
     switch (it->state()) {
       case LookupIterator::NOT_FOUND:
       case LookupIterator::TRANSITION:
         UNREACHABLE();
       case LookupIterator::ACCESS_CHECK:
         // Ignore access checks.
         break;
+      case LookupIterator::INTEGER_INDEXED_EXOTIC:
       case LookupIterator::INTERCEPTOR:
       case LookupIterator::JSPROXY:
         return it->isolate()->factory()->undefined_value();
       case LookupIterator::ACCESSOR: {
         Handle<Object> accessors = it->GetAccessors();
         if (!accessors->IsAccessorInfo()) {
           return it->isolate()->factory()->undefined_value();
         }
         MaybeHandle<Object> maybe_result = JSObject::GetPropertyWithAccessor(
             it->GetReceiver(), it->name(), it->GetHolder<JSObject>(),
@@ skipping 2726 matching lines @@
   return Smi::FromInt(isolate->debug()->is_active());
 }
 
 
 RUNTIME_FUNCTION(Runtime_DebugBreakInOptimizedCode) {
   UNIMPLEMENTED();
   return NULL;
 }
 }
 }  // namespace v8::internal