Remove older deprecated flags; more cleanup to the cli help args.

tools/testing/dart/test_suite.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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 1467 matching lines @@
   List<String> commonArgumentsFromFile(Path filePath, Map optionsFromFile) {
     List args = TestUtils.standardOptions(configuration);
 
     String packages = packagesArgument(optionsFromFile['packageRoot'],
                                        optionsFromFile['packages']);
     if (packages != null) {
       args.add(packages);
     }
     args.addAll(additionalOptions(filePath));
     if (configuration['analyzer']) {
-      args.add('--machine');
+      args.add('--format=machine');
       args.add('--no-hints');
     }
 
     if (configuration["compiler"] == "dart2analyzer" &&
         (filePath.filename.contains("dart2js") ||
             filePath.directoryPath.segments().last.contains('html_common'))) {
       args.add("--use-dart2js-libraries");
     }
 
     bool isMultitest = optionsFromFile["isMultitest"];
@@ skipping 922 matching lines @@
       }
       if (path.length > WINDOWS_SHORTEN_PATH_LIMIT) {
         ++shortNameCounter;
         var pathEnd = path.substring(path.length - WINDOWS_PATH_END_LENGTH);
         path = "short${shortNameCounter}_$pathEnd";
       }
     }
     return path;
   }
 }