Remove MIPS support

tools/testing/dart/configuration.dart

 // Copyright (c) 2017, 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:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'compiler_configuration.dart';
 import 'http_server.dart';
@@ skipping 425 matching lines @@
   static const ia32 = const Architecture._('ia32');
   static const x64 = const Architecture._('x64');
   static const arm = const Architecture._('arm');
   static const armv6 = const Architecture._('armv6');
   static const armv5te = const Architecture._('armv5te');
   static const arm64 = const Architecture._('arm64');
   static const simarm = const Architecture._('simarm');
   static const simarmv6 = const Architecture._('simarmv6');
   static const simarmv5te = const Architecture._('simarmv5te');
   static const simarm64 = const Architecture._('simarm64');
-  static const mips = const Architecture._('mips');
-  static const simmips = const Architecture._('simmips');
   static const simdbc = const Architecture._('simdbc');
   static const simdbc64 = const Architecture._('simdbc64');
 
   static final List<String> names = _all.keys.toList();
 
   static final _all = new Map<String, Architecture>.fromIterable([
     ia32,
     x64,
     arm,
     armv6,
     armv5te,
     arm64,
     simarm,
     simarmv6,
     simarmv5te,
     simarm64,
-    mips,
-    simmips,
     simdbc,
     simdbc64
   ], key: (Architecture architecture) => architecture.name);
 
   static Architecture find(String name) {
     var architecture = _all[name];
     if (architecture != null) return architecture;
 
     throw new ArgumentError('Unknown architecture "$name".');
   }
@@ skipping 279 matching lines @@
 
       case macos:
         return 'xcodebuild/';
     }
 
     throw "unreachable";
   }
 
   String toString() => "System($name)";
 }