Add LookupIterator constructor for arbitrary Object keys

src/lookup.h

 // 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.
 
 #ifndef V8_LOOKUP_H_
 #define V8_LOOKUP_H_
 
 #include "src/factory.h"
 #include "src/isolate.h"
 #include "src/objects.h"
@@ skipping 140 matching lines @@
     name = Name::Flatten(name);
     uint32_t index;
     LookupIterator it =
         name->AsArrayIndex(&index)
             ? LookupIterator(isolate, receiver, index, holder, configuration)
             : LookupIterator(receiver, name, holder, configuration);
     it.name_ = name;
     return it;
   }
 
+  static LookupIterator PropertyOrElement(
+      Isolate* isolate, Handle<Object> receiver, Handle<Object> key,
+      bool* success, Configuration configuration = DEFAULT);
+
   Isolate* isolate() const { return isolate_; }
   State state() const { return state_; }
 
   Handle<Name> name() const {
     DCHECK(!IsElement());
     return name_;
   }
   Handle<Name> GetName() {
     if (name_.is_null()) {
       DCHECK(IsElement());
@@ skipping 141 matching lines @@
   Handle<JSReceiver> holder_;
   Handle<Map> holder_map_;
   const Handle<JSReceiver> initial_holder_;
   uint32_t number_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOOKUP_H_