Fix super noSuchMethod handling.

pkg/compiler/lib/src/resolution/send_structure.dart

Index: pkg/compiler/lib/src/resolution/send_structure.dart
diff --git a/pkg/compiler/lib/src/resolution/send_structure.dart b/pkg/compiler/lib/src/resolution/send_structure.dart
index 5daa7bd117401973d362cf46e85b67630d440038..5ff76effa0b996fe8a516ee26f86c3f4a76fb6ff 100644
--- a/pkg/compiler/lib/src/resolution/send_structure.dart
+++ b/pkg/compiler/lib/src/resolution/send_structure.dart
@@ -769,7 +769,11 @@ class SetStructure<R, A> implements SendStructure<R, A> {
         // TODO(johnniwinther): Should this be a valid case?
         break;
       case AccessKind.UNRESOLVED_SUPER:
-        // TODO(johnniwinther): Handle this separately.
+        return visitor.visitUnresolvedSuperSet(
+            node,
+            semantics.element,
+            node.arguments.single,
+            arg);
       case AccessKind.UNRESOLVED:
         return visitor.visitUnresolvedSet(
             node,