Use failedAt in more places

pkg/compiler/lib/src/world.dart

Index: pkg/compiler/lib/src/world.dart
diff --git a/pkg/compiler/lib/src/world.dart b/pkg/compiler/lib/src/world.dart
index 21088007e8b24d13c4d1a3d6a513babfe93b5746..0a9527dc9b867b2b76cd2bdbddea83732e963fc6 100644
--- a/pkg/compiler/lib/src/world.dart
+++ b/pkg/compiler/lib/src/world.dart
@@ -1229,8 +1229,8 @@ class ClosedWorldImpl extends ClosedWorldBase {
   /// will hit a method at runtime, and not go through [noSuchMethod].
   bool hasConcreteMatch(ClassElement cls, Selector selector,
       {ClassElement stopAtSuperclass}) {
-    assert(invariant(cls, isInstantiated(cls),
-        message: '$cls has not been instantiated.'));
+    assert(
+        isInstantiated(cls), failedAt(cls, '$cls has not been instantiated.'));
     MemberElement element = findMatchIn(cls, selector);
     if (element == null) return false;