Remove MIPS support

tools/gardening/lib/src/buildbot_data.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 'buildbot_structures.dart';
 
 /// Data describing the steps of the buildbots.
 const List<BuildGroup> buildGroups = const <BuildGroup>[
   const BuildGroup(
     groupName: 'vm',
@@ skipping 76 matching lines @@
         'vm tests',
         'checked vm tests',
       ]),
       const BuildSubgroup(shardNames: const <String>[
         'vm-win-release-ia32-be',
       ], testSteps: const <String>[
         'vm tests',
         'checked vm tests',
       ]),
       const BuildSubgroup(shardNames: const <String>[
-        'vm-linux-debug-simmips-be',
-      ], testSteps: const <String>[
-        'vm tests',
-        'checked vm tests',
-      ]),
-      const BuildSubgroup(shardNames: const <String>[
-        'vm-linux-release-simmips-be',
-      ], testSteps: const <String>[
-        'vm tests',
-        'checked vm tests',
-      ]),
-      const BuildSubgroup(shardNames: const <String>[
         'vm-linux-debug-simarm-be',
       ], testSteps: const <String>[
         'vm tests',
         'checked vm tests',
       ]),
       const BuildSubgroup(shardNames: const <String>[
         'vm-linux-release-simarm-be',
       ], testSteps: const <String>[
         'vm tests',
         'checked vm tests',
@@ skipping 734 matching lines @@
   }
 
   List<BuildUri> createShardUris(String shardName, int buildNumber) {
     List<BuildUri> uriList = <BuildUri>[];
     for (String testStep in testSteps) {
       uriList.add(new BuildUri.fromData(shardName, buildNumber, testStep));
     }
     return uriList;
   }
 }