Create synthetic FieldElement(s) (don't use non-synthetic ones) for non-synthetic class getters/set…

pkg/analyzer/lib/src/generated/resolver.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.resolver;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 3125 matching lines @@
     _typeAliases.add(element);
   }
 
   void addTypeParameter(TypeParameterElement element) {
     if (_typeParameters == null) {
       _typeParameters = new List<TypeParameterElement>();
     }
     _typeParameters.add(element);
   }
 
-  FieldElement getField(String fieldName) {
+  FieldElement getField(String fieldName, {bool synthetic: false}) {
     if (_fields == null) {
       return null;
     }
     int length = _fields.length;
     for (int i = 0; i < length; i++) {
       FieldElement field = _fields[i];
-      if (field.name == fieldName) {
+      if (field.name == fieldName && field.isSynthetic == synthetic) {
         return field;
       }
     }
     return null;
   }
 
   TopLevelVariableElement getTopLevelVariable(String variableName) {
     if (_topLevelVariables == null) {
       return null;
     }
@@ skipping 7827 matching lines @@
       return null;
     }
     if (identical(node.staticElement, variable)) {
       if (node.inSetterContext()) {
         result = true;
       }
     }
     return null;
   }
 }