Add 'self_check' runtime for running self-checking unit tests

pkg/kernel/test/class_hierarchy_self_check.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 'package:kernel/kernel.dart';
 import 'package:kernel/class_hierarchy.dart';
 import 'package:test/test.dart';
 import 'class_hierarchy_basic.dart';
 import 'dart:io';
 import 'dart:math';
+import 'self_check_util.dart';
+
+main(List<String> args) {
+  runSelfCheck(args, (String filename) {
+    testClassHierarchyOnProgram(loadProgramFromBinary(filename));
+  });
+}
 
 void testClassHierarchyOnProgram(Program program, {bool verbose: false}) {
   BasicClassHierarchy basic = new BasicClassHierarchy(program);
   ClassHierarchy classHierarchy = new ClassHierarchy(program);
   int total = classHierarchy.classes.length;
   int progress = 0;
   for (var class1 in classHierarchy.classes) {
     for (var class2 in classHierarchy.classes) {
       bool isSubclass = classHierarchy.isSubclassOf(class1, class2);
       bool isSubmixture = classHierarchy.isSubmixtureOf(class1, class2);
@@ skipping 87 matching lines @@
     ++progress;
     if (verbose) {
       stdout.write('\rInterface queries ${100 * progress ~/ total}%');
     }
   }
   for (var classNode in classHierarchy.classes) {
     String getHash(member, superMember, setter) {
       String eq = setter ? '=' : '';
       return '$member$eq overrides $superMember$eq';
     }
+
     Set<String> expectedOverrides = new Set<String>();
     basic.forEachOverridePair(classNode, (member, superMember, setter) {
       expectedOverrides.add(getHash(member, superMember, setter));
     });
     Set<String> actualOverrides = new Set<String>();
-    classHierarchy.forEachOverridePair(classNode, (member, superMember, setter) {
+    classHierarchy.forEachOverridePair(classNode,
+        (member, superMember, setter) {
       actualOverrides.add(getHash(member, superMember, setter));
     });
     for (var actual in actualOverrides) {
       if (!expectedOverrides.contains(actual)) {
         fail("forEachOverridePair($classNode) should not report that $actual");
       }
     }
     for (var expected in expectedOverrides) {
       if (!actualOverrides.contains(expected)) {
         fail("forEachOverridePair($classNode) did not report that $expected");
       }
     }
   }
   if (verbose) {
     print('\rProgress 100%. Done.');
   }
 }
 
 var random = new Random(12345);
 
 List/*<T>*/ pickRandom/*<T>*/(List/*<T>*/ items, int n) {
-  var result = /*<T>*/[];
+  var result = /*<T>*/ [];
   for (int i = 0; i < n; ++i) {
     result.add(items[random.nextInt(items.length)]);
   }
   return result;
 }