fix reconfigure of indexed integer exotic objects

src/objects.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 <iomanip>
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 4144 matching lines @@
     Handle<Object> value,
     PropertyAttributes attributes,
     ExecutableAccessorInfoHandling handling) {
   DCHECK(!value->IsTheHole());
   LookupIterator it(object, name, LookupIterator::OWN_SKIP_INTERCEPTOR);
   bool is_observed = object->map()->is_observed() &&
                      !it.isolate()->IsInternallyUsedPropertyName(name);
   for (; it.IsFound(); it.Next()) {
     switch (it.state()) {
       case LookupIterator::INTEGER_INDEXED_EXOTIC:
+        return value;
+
       case LookupIterator::INTERCEPTOR:
       case LookupIterator::JSPROXY:
       case LookupIterator::NOT_FOUND:
       case LookupIterator::TRANSITION:
         UNREACHABLE();
 
       case LookupIterator::ACCESS_CHECK:
         if (!it.isolate()->MayAccess(object)) {
           return SetPropertyWithFailedAccessCheck(&it, value, SLOPPY);
         }
@@ skipping 12993 matching lines @@
                                                CompilationInfo* info) {
   Handle<DependentCode> codes = DependentCode::InsertCompilationInfo(
       handle(cell->dependent_code(), info->isolate()),
       DependentCode::kPropertyCellChangedGroup, info->object_wrapper());
   if (*codes != cell->dependent_code()) cell->set_dependent_code(*codes);
   info->dependencies(DependentCode::kPropertyCellChangedGroup)->Add(
       cell, info->zone());
 }
 
 } }  // namespace v8::internal