Remove MIPS support

tests/co19/co19-runtime.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.
 
 [ $runtime == vm ]
 # These tests are timing dependent and should be non-flaky once the fix for
 # https://github.com/dart-lang/co19/issues/86 is merged into master.
 # (They are skipped on $runtime == pre_compiled below.)
 LibTest/isolate/Isolate/spawnUri_A01_t06: Pass, Fail # Issue 28269
 LibTest/isolate/Isolate/spawnUri_A01_t07: Pass, Fail  # Issue 28269
@@ skipping 37 matching lines @@
 LibTest/typed_data/Float32x4/reciprocalSqrt_A01_t01: Pass, Fail # co19 issue 599
 LibTest/typed_data/Float32x4/reciprocal_A01_t01: Pass, Fail # co19 issue 599
 # With asynchronous loading, the load errors in these tests are no longer recognized as compile errors:
 
 [ ($runtime == vm || $runtime == dart_precompiled ) && $mode == debug ]
 LibTest/core/List/List_class_A01_t02: Pass, Slow
 
 [ ($runtime == vm || $runtime == dart_precompiled) && ($arch != x64 && $arch != simarm64 && $arch != arm64 && $arch != simdbc64 && $arch != simdbc) ]
 LibTest/core/int/operator_left_shift_A01_t02: Fail # co19 issue 129
 
-[ ($compiler == none || $compiler == precompiler) && ($runtime == vm || $runtime == dart_precompiled) && ($arch == mips || $arch == arm64) ]
+[ ($compiler == none || $compiler == precompiler) && ($runtime == vm || $runtime == dart_precompiled) && $arch == arm64 ]
 # These tests take too much memory (300 MB) for our 1 GB test machine.
 # co19 issue 673. http://code.google.com/p/co19/issues/detail?id=673
 LibTest/core/List/List_class_A01_t02: Skip # co19 issue 673
 LibTest/collection/ListMixin/ListMixin_class_A01_t02: Skip # co19 issue 673
 LibTest/collection/ListBase/ListBase_class_A01_t02: Skip # co19 issue 673
 
-[ ($runtime == vm || $runtime == dart_precompiled) && ($arch == simarm || $arch == simarmv6 || $arch == simarmv5te || $arch == simmips || $arch == simarm64 || $arch == simdbc || $arch == simdbc64) ]
+[ ($runtime == vm || $runtime == dart_precompiled) && ($arch == simarm || $arch == simarmv6 || $arch == simarmv5te || $arch == simarm64 || $arch == simdbc || $arch == simdbc64) ]
 LibTest/collection/DoubleLinkedQueue/DoubleLinkedQueue_class_A01_t01: Skip # Timeout
 LibTest/collection/IterableBase/IterableBase_class_A01_t02: Skip  # Timeout
 LibTest/collection/IterableMixin/IterableMixin_class_A02_t01: Skip  # Timeout
 LibTest/collection/ListBase/ListBase_class_A01_t01: Skip  # Timeout
 LibTest/collection/ListBase/ListBase_class_A01_t02: Skip  # Timeout
 LibTest/collection/ListMixin/ListMixin_class_A01_t01: Skip  # Timeout
 LibTest/collection/ListMixin/ListMixin_class_A01_t02: Skip  # Timeout
 LibTest/core/Uri/Uri_A06_t03: Skip  # Timeout
 
 [ $system == windows ]
@@ skipping 309 matching lines @@
 Language/Types/Static_Types/malformed_type_t02: CompileTimeError
 Language/Types/Static_Types/malformed_type_t03: CompileTimeError
 Language/Types/Static_Types/malformed_type_t04: CompileTimeError
 Language/Types/Static_Types/malformed_type_t05: CompileTimeError
 Language/Types/Static_Types/malformed_type_t06: CompileTimeError
 Language/Expressions/Await_Expressions/syntax_t07: CompileTimeError
 Language/Expressions/Await_Expressions/syntax_t08: CompileTimeError
 Language/Expressions/Await_Expressions/syntax_t09: CompileTimeError
 Language/Expressions/Identifier_Reference/async_and_generator_t01: CompileTimeError