[heap] Move {hidden_string} into the root list.

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 10095 matching lines @@
 #undef DECL_BOOLEAN_ACCESSORS
 #undef DECL_ACCESSORS
 #undef DECLARE_CAST
 #undef DECLARE_VERIFIER
 
 #define VISITOR_SYNCHRONIZATION_TAGS_LIST(V)                               \
   V(kStringTable, "string_table", "(Internalized strings)")                \
   V(kExternalStringsTable, "external_strings_table", "(External strings)") \
   V(kStrongRootList, "strong_root_list", "(Strong roots)")                 \
   V(kSmiRootList, "smi_root_list", "(Smi roots)")                          \
-  V(kInternalizedString, "internalized_string", "(Internal string)")       \
   V(kBootstrapper, "bootstrapper", "(Bootstrapper)")                       \
   V(kTop, "top", "(Isolate)")                                              \
   V(kRelocatable, "relocatable", "(Relocatable)")                          \
   V(kDebug, "debug", "(Debugger)")                                         \
   V(kCompilationCache, "compilationcache", "(Compilation cache)")          \
   V(kHandleScope, "handlescope", "(Handle scope)")                         \
   V(kBuiltins, "builtins", "(Builtins)")                                   \
   V(kGlobalHandles, "globalhandles", "(Global handles)")                   \
   V(kEternalHandles, "eternalhandles", "(Eternal handles)")                \
   V(kThreadManager, "threadmanager", "(Thread manager)")                   \
@@ skipping 108 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_