Remove and hide analyzer cli flags.

pkg/analyzer/lib/src/command_line/arguments.dart

 // Copyright (c) 2016, 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.src.command_line.arguments;
 
 import 'dart:collection';
 
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/context/builder.dart';
@@ skipping 142 matching lines @@
   // Hidden flags and options.
   //
   parser.addOption(defineVariableOption,
       abbr: 'D',
       allowMultiple: true,
       help: 'Define environment variables. For example, "-Dfoo=bar" defines an '
           'environment variable named "foo" whose value is "bar".',
       hide: hide);
   parser.addOption(packagesOption,
       help: 'The path to the package resolution configuration file, which '
-          'supplies a mapping of package names to paths. This option cannot be '
+          'supplies a mapping of package names\nto paths. This option cannot be '
           'used with --package-root.',
       hide: ddc);
   parser.addOption(sdkSummaryPathOption,
       help: 'The path to the Dart SDK summary file.', hide: hide);
   parser.addFlag(enableStrictCallChecksFlag,
       help: 'Fix issue 21938.',
       defaultsTo: false,
       negatable: false,
       hide: hide);
   parser.addFlag(enableInitializingFormalAccessFlag,
@@ skipping 128 matching lines @@
           .replaceAll('\r\n', '\n')
           .replaceAll('\r', '\n')
           .split('\n')
           .where((String line) => line.isNotEmpty));
     } on FileSystemException catch (e) {
       throw new Exception('Failed to read file specified by $lastArg : $e');
     }
   }
   return args;
 }