Revert "Reland "Merge more Kernel infrastructure from kernel_sdk SDK fork.""

tests/kernel/unsorted/mapliteral_test.dart

-// Copyright (c) 2016, 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 'expect.dart';
-
-main() {
-  var map = {
-    'k1': 'v1',
-    'k2': 'v2',
-    1: 2,
-    1.5 : 1.2,
-    3: 3.14,
-  };
-
-  Expect.isTrue(map.length == 5);
-
-  map['foo'] = 'bar';
-
-  Expect.isTrue(map['k1'] == 'v1');
-  Expect.isTrue(map['k2'] == 'v2');
-  Expect.isTrue(map[1] == 2);
-  Expect.isTrue(map[1.5] == 1.2);
-  Expect.isTrue(map[3] == 3.14);
-  Expect.isTrue(map['foo'] == 'bar');
-  Expect.isTrue(map.length == 6);
-}