Remove unnecessary overrides of PropertyAccessorElementImpl.operator== and hashCode

pkg/analyzer/lib/src/dart/element/handle.dart

 // Copyright (c) 2014, 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 analyzer.src.generated.element_handle;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/constant/value.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 953 matching lines @@
 
   @override
   PropertyAccessorElement get correspondingGetter =>
       actualElement.correspondingGetter;
 
   @override
   PropertyAccessorElement get correspondingSetter =>
       actualElement.correspondingSetter;
 
   @override
-  bool get isGetter => actualElement.isGetter;
+  bool get isGetter => !isSetter;
 
   @override
-  bool get isSetter => actualElement.isSetter;
+  bool get isSetter => location.components.last.endsWith('=');
 
   @override
   ElementKind get kind {
     if (isGetter) {
       return ElementKind.GETTER;
     } else {
       return ElementKind.SETTER;
     }
   }
 
@@ skipping 122 matching lines @@
 
   @override
   bool get isStatic => actualElement.isStatic;
 
   @override
   DartType get type => actualElement.type;
 
   @override
   DartObject computeConstantValue() => actualElement.computeConstantValue();
 }