[es6] silence access-check failure for well-known symbol properties

src/api.cc

 // 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.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 6774 matching lines @@
   return Utils::ToLocal(i_isolate->factory()->unscopables_symbol());
 }
 
 
 Local<Symbol> v8::Symbol::GetToStringTag(Isolate* isolate) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   return Utils::ToLocal(i_isolate->factory()->to_string_tag_symbol());
 }
 
 
+Local<Symbol> v8::Symbol::GetIsConcatSpreadable(Isolate* isolate) {
+  i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  return Utils::ToLocal(i_isolate->factory()->is_concat_spreadable_symbol());
+}
+
+
 Local<Number> v8::Number::New(Isolate* isolate, double value) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
   if (std::isnan(value)) {
     // Introduce only canonical NaN value into the VM, to avoid signaling NaNs.
     value = std::numeric_limits<double>::quiet_NaN();
   }
   ENTER_V8(internal_isolate);
   i::Handle<i::Object> result = internal_isolate->factory()->NewNumber(value);
   return Utils::NumberToLocal(result);
 }
@@ skipping 1550 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8