Use failedAt in more places

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

Index: pkg/compiler/lib/src/kernel/no_such_method_resolver.dart
diff --git a/pkg/compiler/lib/src/kernel/no_such_method_resolver.dart b/pkg/compiler/lib/src/kernel/no_such_method_resolver.dart
index af80ffcf3fa3d4a32196a2e53d2cbac2ee840959..eb7394438fee9fa1314276ffabc9dd2456a675db 100644
--- a/pkg/compiler/lib/src/kernel/no_such_method_resolver.dart
+++ b/pkg/compiler/lib/src/kernel/no_such_method_resolver.dart
@@ -84,8 +84,8 @@ class KernelNoSuchMethodResolver implements NoSuchMethodResolver {
     }
     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;
   }
 }