Remove MIPS support

pkg/pkg.status

 # Copyright (c) 2012, 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.
 
 # Don't run any test-like files that show up in packages directories. It
 # shouldn't be necessary to run "pub install" in these packages, but if you do
 # it shouldn't break the tests.
 */packages/*/*: Skip
 */*/packages/*/*: Skip
 */*/*/packages/*/*: Skip
@@ skipping 171 matching lines @@
 compiler/tool/*: SkipByDesign # Only meant to run on vm
 front_end/tool/*: SkipByDesign # Only meant to run on vm
 http_server/test/*: Fail, OK # Uses dart:io.
 observe/test/transformer_test: Fail, OK # Uses dart:io.
 observe/test/unique_message_test: SkipByDesign  # Uses dart:io.
 dart_messages/test/dart_messages_test: Skip  # Uses dart:io.
 
 [ $browser || $jscl ]
 kernel/test/*: SkipByDesign # Uses dart:io and bigints.
 
-[ $runtime == vm && ($arch == simarm64 || $arch == simarm || $arch == simarmv6 || $arch == simarmv5te || $arch == simmips || $arch == armv6 || $arch == armv5te) ]
+[ $runtime == vm && ($arch == simarm64 || $arch == simarm || $arch == simarmv6 || $arch == simarmv5te || $arch == armv6 || $arch == armv5te) ]
 # Timeout. These are not unit tests. They do not run efficiently on our
 # simulator or low-end devices.
 *: Skip
 
 [ $runtime == vm ]
 analyzer/test/file_system/physical_resource_provider_test: Pass, Fail # Issue 25472
 analyzer/test/src/task/strong/inferred_type_test: Pass, Slow
 # Skip tests on the VM if the package depends on dart:html
 mutation_observer: Skip
 
@@ skipping 11 matching lines @@
 kernel/test/closures_test: Fail
 
 [ $runtime == vm ]
 analyzer_cli/test/driver_test: Pass, Slow
 
 [ $runtime == vm && $system == windows ]
 analyzer/test/src/task/strong/checker_test: Pass, Slow
 
 [ $browser ]
 testing/test/analyze_test: SkipByDesign