message: dotest.py has migrated from accepting multiple arch'es to test for,
  to only taking one on llvm.org.  Update some code on the github
  dotest.py that was still assuming that archs was an array.
diff: @@ -1109,8 +1109,8 @@ def getPathForSDK(sdk):
  def setDefaultTripleForPlatform():
  infix = getInfixForPlatform(configuration.lldb_platform_name)
  sdk = getSDKForPlatform(configuration.lldb_platform_name)
  - if infix != None and sdk != None and len(configuration.archs) > 0:
  - triple_str = configuration.archs[0] + infix + getVersionForSDK(sdk)
  + if infix != None and sdk != None and len(configuration.arch) > 0:
  + triple_str = configuration.arch + infix + getVersionForSDK(sdk)
  os.environ['TRIPLE'] = triple_str
  return {'TRIPLE': triple_str}
  return {}
  