[builtins] take slow path in IsConcatSpreadable if proxy in prototype

src/isolate.h

 // Copyright 2012 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_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <memory>
 #include <queue>
 #include <set>
@@ skipping 967 matching lines @@
 
   Map* get_initial_js_array_map(ElementsKind kind);
 
   static const int kArrayProtectorValid = 1;
   static const int kArrayProtectorInvalid = 0;
 
   bool IsFastArrayConstructorPrototypeChainIntact();
   inline bool IsArraySpeciesLookupChainIntact();
   inline bool IsHasInstanceLookupChainIntact();
   bool IsIsConcatSpreadableLookupChainIntact();
+  bool IsIsConcatSpreadableLookupChainIntact(JSReceiver* receiver);
 
   // On intent to set an element in object, make sure that appropriate
   // notifications occur if the set is on the elements of the array or
   // object prototype. Also ensure that changes to prototype chain between
   // Array and Object fire notifications.
   void UpdateArrayProtectorOnSetElement(Handle<JSObject> object);
   void UpdateArrayProtectorOnSetLength(Handle<JSObject> object) {
     UpdateArrayProtectorOnSetElement(object);
   }
   void UpdateArrayProtectorOnSetPrototype(Handle<JSObject> object) {
@@ skipping 643 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_