[runtime] Replace hidden_string with a 0-hash-code private symbol

src/lookup.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/lookup.h"
 
 #include "src/bootstrapper.h"
 #include "src/deoptimizer.h"
 #include "src/elements.h"
 #include "src/field-type.h"
@@ skipping 588 matching lines @@
   DisallowHeapAllocation no_gc;
   if (interceptor_state_ == InterceptorState::kProcessNonMasking) {
     return LookupNonMaskingInterceptorInHolder(map, holder);
   }
   switch (state_) {
     case NOT_FOUND:
       if (map->IsJSProxyMap()) {
         // Do not leak private property names.
         if (IsElement() || !name_->IsPrivate()) return JSPROXY;
       }
-      if (map->is_access_check_needed() &&
-          (IsElement() || !isolate_->IsInternallyUsedPropertyName(name_))) {
-        return ACCESS_CHECK;
+      if (map->is_access_check_needed()) {
+        if (IsElement() || !name_->IsPrivate()) return ACCESS_CHECK;
       }
     // Fall through.
     case ACCESS_CHECK:
       if (check_interceptor() && HasInterceptor(map) &&
           !SkipInterceptor(JSObject::cast(holder))) {
         // Do not leak private property names.
         if (!name_.is_null() && name_->IsPrivate()) return NOT_FOUND;
         return INTERCEPTOR;
       }
     // Fall through.
@@ skipping 60 matching lines @@
     // Fall through.
     default:
       return NOT_FOUND;
   }
   UNREACHABLE();
   return state_;
 }
 
 }  // namespace internal
 }  // namespace v8