Handle super-method invocations in CPS->JS backend.

pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart

Index: pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
diff --git a/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart b/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
index 48210523499ad6890735cb4279ca3934f4570fb2..92bb00a6de7e307ba303633c94931308ee6edbd9 100644
--- a/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
+++ b/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
@@ -372,7 +372,8 @@ class ParentVisitor extends RecursiveVisitor {
     node.arguments.forEach((Reference ref) => ref.parent = node);
   }
 
-  processInvokeSuperMethod(InvokeSuperMethod node) {
+  processInvokeMethodDirectly(InvokeMethodDirectly node) {
+    node.receiver.parent = node;
     node.continuation.parent = node;
     node.arguments.forEach((Reference ref) => ref.parent = node);
   }