Fix KernelEquivalence.entityEquivalence for equi-named instance/top-level members

pkg/compiler/lib/src/kernel/element_map.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.
 
 library dart2js.kernel.element_map;
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../common.dart';
 import '../common/resolution.dart';
@@ skipping 1232 matching lines @@
   @override
   bool checkClass(ClassEntity cls) => true;
 }
 
 // Interface for testing equivalence of Kernel-based entities.
 class WorldDeconstructionForTesting {
   final KernelToElementMap builder;
 
   WorldDeconstructionForTesting(this.builder);
 
-  KLibrary _getLibrary<E>(E member, Map<ir.Member, E> map) {
-    ir.Library library;
-    map.forEach((ir.Member node, E other) {
-      if (library == null && member == other) {
-        library = node.enclosingLibrary;
-      }
-    });
-    if (library == null) {
-      throw new ArgumentError("No library found for $member");
-    }
-    return builder._getLibrary(library);
-  }
-
-  KLibrary getLibraryForFunction(KFunction function) =>
-      _getLibrary(function, builder._methodMap);
-
-  KLibrary getLibraryForField(KField field) =>
-      _getLibrary(field, builder._fieldMap);
-
   KClass getSuperclassForClass(KClass cls) {
     _KClassEnv env = builder._classEnvs[cls.classIndex];
     ir.Supertype supertype = env.cls.supertype;
     if (supertype == null) return null;
     return builder.getClass(supertype.classNode);
   }
 
   bool isUnnamedMixinApplication(KClass cls) {
     _KClassEnv env = builder._classEnvs[cls.classIndex];
     return env.isUnnamedMixinApplication;
   }
 
   InterfaceType getMixinTypeForClass(KClass cls) {
     _KClassEnv env = builder._classEnvs[cls.classIndex];
     ir.Supertype mixedInType = env.cls.mixedInType;
     if (mixedInType == null) return null;
     return builder.createInterfaceType(
         mixedInType.classNode, mixedInType.typeArguments);
   }
 }