Remove MIPS support

tools/testing/dart/compiler_configuration.dart

 // Copyright (c) 2014, 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 compiler_configuration;
 
 import 'dart:io' show Platform;
 
 import 'runtime_configuration.dart' show RuntimeConfiguration;
 import 'runtime_configuration.dart' show DartPrecompiledAdbRuntimeConfiguration;
@@ skipping 703 matching lines @@
 
     String cc_flags;
     if (arch == 'x64') {
       cc_flags = "-m64";
     } else if (arch == 'simarm64') {
       cc_flags = "-m64";
     } else if (arch == 'ia32') {
       cc_flags = "-m32";
     } else if (arch == 'simarm') {
       cc_flags = "-m32";
-    } else if (arch == 'simmips') {
-      cc_flags = "-m32";
     } else if (arch == 'arm') {
       cc_flags = null;
     } else if (arch == 'arm64') {
       cc_flags = null;
-    } else if (arch == 'mips') {
-      cc_flags = "-EL";
     } else {
       throw "Architecture not supported: $arch";
     }
 
     var exec = cc;
     var args = <String>[];
     if (cc_flags != null) args.add(cc_flags);
     if (ld_flags != null) args.add(ld_flags);
     args.add(shared);
     args.add('-nostdlib');
@@ skipping 214 matching lines @@
       RuntimeConfiguration runtimeConfiguration,
       String buildDir,
       TestInformation info,
       List<String> vmOptions,
       List<String> sharedOptions,
       List<String> originalArguments,
       CommandArtifact artifact) {
     return <String>[];
   }
 }