Use entities in Selector methods

pkg/compiler/lib/src/ssa/builder.dart

 // 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.
 
 import 'dart:collection';
 
 import 'package:js_runtime/shared/embedded_names.dart';
 
 import '../closure.dart';
 import '../common.dart';
@@ skipping 3051 matching lines @@
     var inputs = <HInstruction>[pop()];
     push(buildInvokeSuper(Selectors.noSuchMethod_, element, inputs));
   }
 
   /// Generate a call to a super method or constructor.
   void generateSuperInvoke(ast.Send node, MethodElement method,
       SourceInformation sourceInformation) {
     // TODO(5347): Try to avoid the need for calling [implementation] before
     // calling [makeStaticArgumentList].
     Selector selector = elements.getSelector(node);
-    assert(invariant(node, selector.applies(method.implementation),
-        message: "$selector does not apply to ${method.implementation}"));
+    MethodElement implementation = method.implementation;
+    assert(invariant(node, selector.applies(implementation),
+        message: "$selector does not apply to ${implementation}"));
     List<HInstruction> inputs =
         makeStaticArgumentList(selector.callStructure, node.arguments, method);
     push(buildInvokeSuper(selector, method, inputs, sourceInformation));
   }
 
   /// Access the value from the super [element].
   void handleSuperGet(ast.Send node, Element element) {
     Selector selector = elements.getSelector(node);
     SourceInformation sourceInformation =
         sourceInformationBuilder.buildGet(node);
@@ skipping 1111 matching lines @@
         receiver,
         rhs,
         elements.getOperatorSelectorInComplexSendSet(node),
         elementInferenceResults.typeOfOperator(node),
         node,
         sourceInformation:
             sourceInformationBuilder.buildGeneric(node.assignmentOperator));
   }
 
   void handleSuperSendSet(ast.SendSet node) {
-    Element element = elements[node];
+    MemberElement element = elements[node];
     List<HInstruction> setterInputs = <HInstruction>[];
     void generateSuperSendSet() {
       Selector setterSelector = elements.getSelector(node);
       if (Elements.isUnresolved(element) || !setterSelector.applies(element)) {
         generateSuperNoSuchMethodSend(node, setterSelector, setterInputs);
         pop();
       } else {
         add(buildInvokeSuper(setterSelector, element, setterInputs));
       }
     }
@@ skipping 2547 matching lines @@
       this.oldReturnLocal,
       this.oldReturnType,
       this.oldResolvedAst,
       this.oldStack,
       this.oldLocalsHandler,
       this.inTryStatement,
       this.allFunctionsCalledOnce,
       this.oldElementInferenceResults)
       : super(function);
 }