ES6 symbols: Introduce Symbol class, along with abstract Name class

test/cctest/SConscript

 # Copyright 2012 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 76 matching lines @@
     'test-parsing.cc',
     'test-platform-tls.cc',
     'test-profile-generator.cc',
     'test-random.cc',
     'test-regexp.cc',
     'test-reloc-info.cc',
     'test-serialize.cc',
     'test-sockets.cc',
     'test-spaces.cc',
     'test-strings.cc',
+    'test-symbols.cc',
     'test-strtod.cc',
     'test-thread-termination.cc',
     'test-threads.cc',
     'test-unbound-queue.cc',
     'test-utils.cc',
     'test-version.cc',
     'test-weakmaps.cc'
   ],
   'arch:arm':  [
     'test-assembler-arm.cc',
@@ skipping 34 matching lines @@
   # There seems to be a glitch in the way scons decides where to put
   # PDB files when compiling using MSVC so we specify it manually.
   # This should not affect any other platforms.
   object_files.append(js_files_obj)
   return env.Program('cctest', ['cctest.cc', cctest_files, object_files],
       PDB='cctest.exe.pdb')
 
 
 program = Build()
 Return('program')