Prepares for arm64 cross-build.

tools/utils.py

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file contains a set of utilities functions used by other Python-based
 # scripts.
 
 import commands
 import os
 import platform
@@ skipping 199 matching lines @@
   'win32': os.path.join('build'),
   'linux': os.path.join('out'),
   'freebsd': os.path.join('out'),
   'macos': os.path.join('xcodebuild'),
 }
 
 ARCH_FAMILY = {
   'ia32': 'ia32',
   'x64': 'ia32',
   'arm': 'arm',
+  'arm64': 'arm',
   'mips': 'mips',
   'simarm': 'ia32',
   'simmips': 'ia32',
   'simarm64': 'ia32',
 }
 
 ARCH_GUESS = GuessArchitecture()
 BASE_DIR = os.path.abspath(os.path.join(os.curdir, '..'))
 DART_DIR = os.path.abspath(os.path.join(__file__, '..', '..'))
 
@@ skipping 330 matching lines @@
     os.chdir(self._working_directory)
 
   def __exit__(self, *_):
     print "Enter directory = ", self._old_cwd
     os.chdir(self._old_cwd)
 
 
 if __name__ == "__main__":
   import sys
   Main(sys.argv)