Use failedAt in more places

pkg/compiler/lib/src/js_backend/patch_resolver.dart

Index: pkg/compiler/lib/src/js_backend/patch_resolver.dart
diff --git a/pkg/compiler/lib/src/js_backend/patch_resolver.dart b/pkg/compiler/lib/src/js_backend/patch_resolver.dart
index 0dfd302191f10ccbfc9ba88b22a7cc28b9adf2f8..b511adf1f9b840ad8a2863958341575768af1b88 100644
--- a/pkg/compiler/lib/src/js_backend/patch_resolver.dart
+++ b/pkg/compiler/lib/src/js_backend/patch_resolver.dart
@@ -54,8 +54,8 @@ class PatchResolverTask extends CompilerTask {
       if (!originParameter.isPatched) {
         originParameter.applyPatch(patchParameter);
       } else {
-        assert(invariant(origin, originParameter.patch == patchParameter,
-            message: "Inconsistent repatch of $originParameter."));
+        assert(originParameter.patch == patchParameter,
+            failedAt(origin, "Inconsistent repatch of $originParameter."));
       }
       ResolutionDartType originParameterType =
           originParameter.computeType(resolution);