Implement getClassicLeastUpperBound() in IncrementalClassHierarchy.

pkg/kernel/test/class_hierarchy_test.dart

 // Copyright (c) 2017, 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/ast.dart';
 import 'package:kernel/class_hierarchy.dart';
 import 'package:kernel/core_types.dart';
 import 'package:kernel/src/incremental_class_hierarchy.dart';
 import 'package:kernel/testing/mock_sdk_program.dart';
 import 'package:kernel/text/ast_to_text.dart';
@@ skipping 30 matching lines @@
   void test_forEachOverridePair_thisOverridesSupertype() {
     super.test_forEachOverridePair_thisOverridesSupertype();
   }
 
   @failingTest
   void test_forEachOverridePair_thisOverridesSupertype_setter() {
     super.test_forEachOverridePair_thisOverridesSupertype_setter();
   }
 
   @failingTest
-  void test_getClassicLeastUpperBound_expansive() {
-    super.test_getClassicLeastUpperBound_expansive();
-  }
-
-  @failingTest
-  void test_getClassicLeastUpperBound_generic() {
-    super.test_getClassicLeastUpperBound_generic();
-  }
-
-  @failingTest
-  void test_getClassicLeastUpperBound_nonGeneric() {
-    super.test_getClassicLeastUpperBound_nonGeneric();
-  }
-
-  @failingTest
   void test_getDispatchTarget() {
     super.test_getDispatchTarget();
   }
 
   @failingTest
   void test_getDispatchTarget_abstract() {
     super.test_getDispatchTarget_abstract();
   }
 
   @failingTest
@@ skipping 855 matching lines @@
     actualText = actualText.replaceAll(' extends core::Object', '');
 
 //    if (actualText != expectedText) {
 //      print('-------- Actual --------');
 //      print(actualText + '------------------------');
 //    }
 
     expect(actualText, expectedText);
   }
 }