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

pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart

Index: pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
diff --git a/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart b/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
index 9620b57f7967cf3278381fa64ada27385dbc9495..9d9df5679006d797dcc9c5322aa5d80b8bd59126 100644
--- a/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
+++ b/pkg/compiler/lib/src/tree_ir/tree_ir_tracer.dart
@@ -333,10 +333,12 @@ class SubexpressionVisitor extends ExpressionVisitor<String> {
     return "$receiver.$name($args)";
   }
 
-  String visitInvokeSuperMethod(InvokeSuperMethod node) {
+  String visitInvokeMethodDirectly(InvokeMethodDirectly node) {
+    String receiver = visitExpression(node.receiver);
+    String host = node.target.enclosingClass.name;
     String name = node.selector.name;
     String args = formatArguments(node);
-    return "super.$name($args)";
+    return "$receiver.$host::$name($args)";
   }
 
   String visitInvokeConstructor(InvokeConstructor node) {