refactor DDC to support --ignore-unrecognized-flags

pkg/analyzer/test/src/command_line/test_all.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.test.src.command_line.test_all;
 
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
-import 'command_line_parser_test.dart' as command_line_parser_test;
 import 'arguments_test.dart' as arguments_test;
 
 main() {
   defineReflectiveSuite(() {
-    command_line_parser_test.main();
     arguments_test.main();
   }, name: 'command_line');
 }