Use failedAt in more places

pkg/compiler/lib/src/kernel/no_such_method_resolver.dart

 // Copyright (c) 2017, 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.
 
 part of dart2js.kernel.element_map;
 
 class KernelNoSuchMethodResolver implements NoSuchMethodResolver {
   final KernelToElementMapImpl elementMap;
 
   KernelNoSuchMethodResolver(this.elementMap);
@@ skipping 66 matching lines @@
             return function;
           }
         }
         // If [member] is not a valid `noSuchMethod` the target is
         // `Object.superNoSuchMethod`.
         break;
       }
     }
     FunctionEntity function = _elementEnvironment.lookupClassMember(
         _commonElements.objectClass, Identifiers.noSuchMethod_);
-    assert(invariant(method, function != null,
-        message: "No super noSuchMethod found for $method."));
+    assert(function != null,
+        failedAt(method, "No super noSuchMethod found for $method."));
     return function;
   }
 }