test rename overhaul: step 12 - standalone

tests/standalone/io/process_test_util.dart

 // 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.
 
 String getPlatformOutDir() {
   var os = Platform.operatingSystem();
   if (os == 'linux') return 'out/';
   if (os == 'macos') return 'xcodebuild/';
   return '';  // Windows.
 }
@@ skipping 32 matching lines @@
                '${outDir}Release_x64/dart$extension',
                '${outDir}Debug_x64/dart$extension'];
 
   for (var name in names) {
     if (new File(name).existsSync()) {
       return name;
     }
   }
   Expect.fail('Could not find the dart executable.');
 }