Remove MIPS support

tools/testing/dart/options.dart

 // Copyright (c) 2013, 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.
 
 import 'dart:io';
 
 import 'configuration.dart';
 import 'drt_updater.dart';
 import 'path.dart';
 import 'utils.dart';
@@ skipping 145 matching lines @@
         defaultsTo: Runtime.vm.name),
     new _Option(
         'arch',
         '''The architecture to run tests for.
 
 Allowed values are:
 all
 ia32, x64
 arm, armv6, armv5te, arm64,
 simarm, simarmv6, simarmv5te, simarm64,
-mips, simmips
 simdbc, simdbc64''',
         abbr: 'a',
         values: ['all']..addAll(Architecture.names),
         defaultsTo: Architecture.x64.name),
     new _Option('system', 'The operating system to run tests on.',
         abbr: 's', values: System.names, defaultsTo: Platform.operatingSystem),
     new _Option.bool('checked', 'Run tests in checked mode.'),
     new _Option.bool('strong', 'Run tests in strong mode.'),
     new _Option.bool('host_checked', 'Run compiler in checked mode.'),
     new _Option.bool('minified', 'Enable minification in the compiler.'),
@@ skipping 587 matching lines @@
       if (name == option.name) return option;
 
       // Allow hyphens instead of underscores as the separator since they are
       // more common for command line flags.
       if (name == option.name.replaceAll("_", "-")) return option;
     }
 
     return null;
   }
 }