Use failedAt in more places

pkg/compiler/lib/src/common/resolution.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.
 
 library dart2js.common.resolution;
 
 import '../common.dart';
 import '../compile_time_constants.dart';
 import '../constants/expressions.dart' show ConstantExpression;
 import '../constants/values.dart' show ConstantValue;
@@ skipping 37 matching lines @@
 }
 
 class _ResolutionWorkItem extends WorkItem implements ResolutionWorkItem {
   bool _isAnalyzed = false;
   final MemberElement element;
   final Resolution resolution;
 
   _ResolutionWorkItem(this.resolution, this.element);
 
   WorldImpact run() {
-    assert(invariant(element, !_isAnalyzed,
-        message: 'Element ${element} has already been analyzed'));
+    assert(!_isAnalyzed,
+        failedAt(element, 'Element ${element} has already been analyzed'));
     WorldImpact impact = resolution.computeWorldImpact(element);
     _isAnalyzed = true;
     return impact;
   }
 }
 
 class ResolutionImpact extends WorldImpact {
   const ResolutionImpact();
 
   Iterable<Feature> get features => const <Feature>[];
@@ skipping 181 matching lines @@
       if (cls.isPatch) {
         patchParser.parsePatchClassNode(cls);
       }
     });
   }
 
   @override
   ScannerOptions getScannerOptionsFor(Element element) => new ScannerOptions(
       canUseNative: backend.canLibraryUseNative(element.library));
 }