[Isolates] Convert more static data either to read-only or to per-isolate.

src/token.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 250 matching lines @@
   }
 
   // Returns the precedence > 0 for binary and compare
   // operators; returns 0 otherwise.
   static int Precedence(Value tok) {
     ASSERT(0 <= tok && tok < NUM_TOKENS);
     return precedence_[tok];
   }
 
  private:
-  static const char* name_[NUM_TOKENS];
-  static const char* string_[NUM_TOKENS];
-  static int8_t precedence_[NUM_TOKENS];
+  static const char* const name_[NUM_TOKENS];
+  static const char* const string_[NUM_TOKENS];
+  static const int8_t precedence_[NUM_TOKENS];
   static const char token_type[NUM_TOKENS];
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TOKEN_H_