cleanup Analyzer CLI and DDC arg parsing

pkg/analyzer_cli/lib/src/options.dart

 // Copyright (c) 2015, 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.
 
 library analyzer_cli.src.options;
 
 import 'dart:io';
 
 import 'package:analyzer/file_system/physical_file_system.dart';
 import 'package:analyzer/src/command_line/arguments.dart';
@@ skipping 262 matching lines @@
       return "<unknown>";
     }
   }
 
   static CommandLineOptions _parse(List<String> args) {
     args = preprocessArgs(PhysicalResourceProvider.INSTANCE, args);
 
     bool verbose = args.contains('-v') || args.contains('--verbose');
     bool hide = !verbose;
 
-    args = args.expand((String arg) => arg.split('=')).toList();
     var parser = new ArgParser(allowTrailingOptions: true)
       ..addFlag('batch',
           abbr: 'b',
           help: 'Read commands from standard input (for testing).',
           defaultsTo: false,
           negatable: false)
       ..addOption('dart-sdk', help: 'The path to the Dart SDK.')
       ..addOption('dart-sdk-summary',
           help: 'The path to the Dart SDK summary file.', hide: true)
       ..addOption('packages',
@@ skipping 268 matching lines @@
 
   static _showUsage(parser) {
     errorSink
         .writeln('Usage: $_binaryName [options...] <libraries to analyze...>');
     errorSink.writeln(parser.getUsage());
     errorSink.writeln('');
     errorSink.writeln(
         'For more information, see http://www.dartlang.org/tools/analyzer.');
   }
 }