dart2js: Fix getter/setter flags in the model.

pkg/compiler/lib/src/js_emitter/program_builder.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 dart2js.js_emitter.program_builder;
 
 import 'js_emitter.dart' show computeMixinClass;
 import 'model.dart';
 
 import '../common.dart';
@@ skipping 370 matching lines @@
   InstanceField _buildInstanceField(VariableElement field,
                                     ClassElement holder) {
     assert(invariant(field, field.isDeclaration));
     String name = namer.fieldPropertyName(field);
 
     int getterFlags = 0;
     if (_fieldNeedsGetter(field)) {
       bool isIntercepted = backend.fieldHasInterceptedGetter(field);
       if (isIntercepted) {
         getterFlags += 2;
-        if (backend.isInterceptorClass(holder)) {
+        if (!backend.isInterceptorClass(holder)) {
           getterFlags += 1;
         }
       } else {
         getterFlags = 1;
       }
     }
 
     int setterFlags = 0;
     if (_fieldNeedsSetter(field)) {
       bool isIntercepted = backend.fieldHasInterceptedSetter(field);
       if (isIntercepted) {
         setterFlags += 2;
-        if (backend.isInterceptorClass(holder)) {
+        if (!backend.isInterceptorClass(holder)) {
           setterFlags += 1;
         }
       } else {
         setterFlags = 1;
       }
     }
 
     return new InstanceField(field, name, getterFlags, setterFlags);
   }
 
@@ skipping 31 matching lines @@
       _registry.registerConstant(outputUnit, constantValue);
       assert(!_constants.containsKey(constantValue));
       String name = namer.constantName(constantValue);
       String constantObject = namer.globalObjectForConstant(constantValue);
       Holder holder = _registry.registerHolder(constantObject);
       Constant constant = new Constant(name, holder, constantValue);
       _constants[constantValue] = constant;
     }
   }
 }