Fix benchmark script to account for the recent executable directory name change.

tools/utils.py

 # Copyright (c) 2011, 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 platform
 import re
 import os
@@ skipping 107 matching lines @@
   'freebsd': os.path.join('out'),
   'macos': os.path.join('xcodebuild'),
 }
 
 def GetBuildMode(mode):
   global BUILD_MODES
   return BUILD_MODES[mode]
 
 
 def GetBuildConf(mode, arch):
-  return GetBuildMode(mode) + "_" + arch
+  return GetBuildMode(mode) + arch.upper()
 
 
 def GetBuildRoot(target_os, mode=None, arch=None):
   global BUILD_ROOT
   if mode:
     return os.path.join(BUILD_ROOT[target_os], GetBuildConf(mode, arch))
   else:
     return BUILD_ROOT[target_os]
 
 
 def Main(argv):
   print "GuessOS() -> ", GuessOS()
   print "GuessArchitecture() -> ", GuessArchitecture()
   print "GuessCpus() -> ", GuessCpus()
   print "IsWindows() -> ", IsWindows()
 
 
 if __name__ == "__main__":
   import sys
   Main(sys.argv)