Remove unnecessary overrides of PropertyAccessorElementImpl.operator== and hashCode

pkg/analyzer/lib/src/dart/element/element.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.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 7510 matching lines @@
 
   /**
    * Set whether this accessor is a getter.
    */
   void set getter(bool isGetter) {
     assert(serializedExecutable == null);
     setModifier(Modifier.GETTER, isGetter);
   }
 
   @override
-  int get hashCode => JenkinsSmiHash.hash2(super.hashCode, isGetter ? 1 : 2);
-
-  @override
   String get identifier {
     String name = displayName;
     String suffix = isGetter ? "?" : "=";
     return "$name$suffix";
   }
 
   @override
   bool get isGetter {
     if (serializedExecutable != null) {
       return serializedExecutable.kind == UnlinkedExecutableKind.getter;
@@ skipping 47 matching lines @@
 
   /**
    * Set whether this accessor is static.
    */
   void set static(bool isStatic) {
     assert(serializedExecutable == null);
     setModifier(Modifier.STATIC, isStatic);
   }
 
   @override
-  bool operator ==(Object object) =>
-      super == object &&
-      isGetter == (object as PropertyAccessorElement).isGetter;
-
-  @override
   accept(ElementVisitor visitor) => visitor.visitPropertyAccessorElement(this);
 
   @override
   void appendTo(StringBuffer buffer) {
     buffer.write(isGetter ? "get " : "set ");
     buffer.write(variable.displayName);
     super.appendTo(buffer);
   }
 
   @override
@@ skipping 832 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }