[classes] Support AccessorInfo-style data properties in super property stores.

src/objects.cc

 // Copyright 2015 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/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 4265 matching lines @@
 
   for (; own_lookup.IsFound(); own_lookup.Next()) {
     switch (own_lookup.state()) {
       case LookupIterator::ACCESS_CHECK:
         if (!own_lookup.HasAccess()) {
           return JSObject::SetPropertyWithFailedAccessCheck(&own_lookup, value,
                                                             should_throw);
         }
         break;
 
+      case LookupIterator::ACCESSOR:
+        if (own_lookup.GetAccessors()->IsAccessorInfo()) {
+          if (own_lookup.IsReadOnly()) {
+            return WriteToReadOnlyProperty(&own_lookup, value, should_throw);
+          }
+          return JSObject::SetPropertyWithAccessor(&own_lookup, value,
+                                                   should_throw);
+        }
+      // Fall through.
       case LookupIterator::INTEGER_INDEXED_EXOTIC:
-      case LookupIterator::ACCESSOR:
         return RedefineIncompatibleProperty(isolate, it->GetName(), value,
                                             should_throw);
 
       case LookupIterator::DATA: {
         if (own_lookup.IsReadOnly()) {
           return WriteToReadOnlyProperty(&own_lookup, value, should_throw);
         }
         return SetDataProperty(&own_lookup, value);
       }
 
@@ skipping 15577 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8