Use symbols instead of hidden properties for i18n markers.

src/runtime/runtime.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_RUNTIME_H_
 #define V8_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
 #include "src/zone.h"
@@ skipping 236 matching lines @@
   F(IsAttachedGlobal, 1, 1)                            \
                                                        \
   F(AddNamedProperty, 4, 1)                            \
   F(AddPropertyForTemplate, 4, 1)                      \
   F(SetProperty, 4, 1)                                 \
   F(AddElement, 4, 1)                                  \
   F(DefineApiAccessorProperty, 5, 1)                   \
   F(DefineDataPropertyUnchecked, 4, 1)                 \
   F(DefineAccessorPropertyUnchecked, 5, 1)             \
   F(GetDataProperty, 2, 1)                             \
-  F(SetHiddenProperty, 3, 1)                           \
                                                        \
   /* Arrays */                                         \
   F(RemoveArrayHoles, 2, 1)                            \
   F(GetArrayKeys, 2, 1)                                \
   F(MoveArrayContents, 2, 1)                           \
   F(EstimateNumberOfElements, 1, 1)                    \
   F(NormalizeElements, 1, 1)                           \
                                                        \
   /* Getters and Setters */                            \
   F(LookupAccessor, 3, 1)                              \
@@ skipping 631 matching lines @@
 class AllocateDoubleAlignFlag : public BitField<bool, 0, 1> {};
 class AllocateTargetSpace : public BitField<AllocationSpace, 1, 3> {};
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 class DeclareGlobalsStrictMode : public BitField<StrictMode, 2, 1> {};
 }
 }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_