introduce android_x64 build target

tools/run_perf.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 """
 Performance runner for d8.
 
 Call e.g. with tools/run-perf.py --arch ia32 some_suite.json
 
@@ skipping 93 matching lines @@
 import re
 import sys
 
 from testrunner.local import commands
 from testrunner.local import utils
 
 ARCH_GUESS = utils.DefaultArch()
 SUPPORTED_ARCHS = ["android_arm",
                    "android_arm64",
                    "android_ia32",
+                   "android_x64",
                    "arm",
                    "ia32",
                    "mips",
                    "mipsel",
                    "nacl_ia32",
                    "nacl_x64",
                    "x64",
                    "arm64"]
 
 GENERIC_RESULTS_RE = re.compile(r"^RESULT ([^:]+): ([^=]+)= ([^ ]+) ([^ ]*)$")
@@ skipping 586 matching lines @@
 
   if options.json_test_results:
     results.WriteToFile(options.json_test_results)
   else:  # pragma: no cover
     print results
 
   return min(1, len(results.errors))
 
 if __name__ == "__main__":  # pragma: no cover
   sys.exit(Main(sys.argv[1:]))