Further reduce LookupResult usage

src/bootstrapper.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/bootstrapper.h"
 
 #include "src/accessors.h"
 #include "src/code-stubs.h"
 #include "src/extensions/externalize-string-extension.h"
 #include "src/extensions/free-buffer-extension.h"
@@ skipping 2427 matching lines @@
           break;
         }
         case CONSTANT: {
           HandleScope inner(isolate());
           Handle<Name> key = Handle<Name>(descs->GetKey(i));
           Handle<Object> constant(descs->GetConstant(i), isolate());
           JSObject::AddProperty(to, key, constant, details.attributes());
           break;
         }
         case CALLBACKS: {
-          LookupResult result(isolate());
-          Handle<Name> key(Name::cast(descs->GetKey(i)), isolate());
-          to->LookupOwn(key, &result);
+          Handle<Name> key(descs->GetKey(i));
+          LookupIterator it(to, key, LookupIterator::CHECK_PROPERTY);
           // If the property is already there we skip it
-          if (result.IsFound()) continue;
+          if (it.IsFound() && it.HasProperty()) continue;
           HandleScope inner(isolate());
           DCHECK(!to->HasFastProperties());
           // Add to dictionary.
           Handle<Object> callbacks(descs->GetCallbacksObject(i), isolate());
           PropertyDetails d = PropertyDetails(
               details.attributes(), CALLBACKS, i + 1);
           JSObject::SetNormalizedProperty(to, key, callbacks, d);
           break;
         }
         case NORMAL:
           // Do not occur since the from object has fast properties.
         case HANDLER:
         case INTERCEPTOR:
         case NONEXISTENT:
           // No element in instance descriptors have proxy or interceptor type.
           UNREACHABLE();
           break;
       }
     }
   } else {
     Handle<NameDictionary> properties =
         Handle<NameDictionary>(from->property_dictionary());
     int capacity = properties->Capacity();
     for (int i = 0; i < capacity; i++) {
       Object* raw_key(properties->KeyAt(i));
       if (properties->IsKey(raw_key)) {
         DCHECK(raw_key->IsName());
         // If the property is already there we skip it.
-        LookupResult result(isolate());
         Handle<Name> key(Name::cast(raw_key));
-        to->LookupOwn(key, &result);
-        if (result.IsFound()) continue;
+        LookupIterator it(to, key, LookupIterator::CHECK_PROPERTY);
+        if (it.IsFound() && it.HasProperty()) continue;
         // Set the property.
         Handle<Object> value = Handle<Object>(properties->ValueAt(i),
                                               isolate());
         DCHECK(!value->IsCell());
         if (value->IsPropertyCell()) {
           value = Handle<Object>(PropertyCell::cast(*value)->value(),
                                  isolate());
         }
         PropertyDetails details = properties->DetailsAt(i);
         JSObject::AddProperty(to, key, value, details.attributes());
@@ skipping 196 matching lines @@
   return from + sizeof(NestingCounterType);
 }
 
 
 // Called when the top-level V8 mutex is destroyed.
 void Bootstrapper::FreeThreadResources() {
   DCHECK(!IsActive());
 }
 
 } }  // namespace v8::internal