Make a single labeled statement hold all its labels.

lib/compiler/implementation/scanner/listener.dart

Index: lib/compiler/implementation/scanner/listener.dart
diff --git a/lib/compiler/implementation/scanner/listener.dart b/lib/compiler/implementation/scanner/listener.dart
index 31c1b0b716d1f0ca7f73eacfd75e352d2d841c2d..c73885c7ccdebb720d27a01a4a9c9a11b4688339 100644
--- a/lib/compiler/implementation/scanner/listener.dart
+++ b/lib/compiler/implementation/scanner/listener.dart
@@ -1446,12 +1446,8 @@ class NodeListener extends ElementListener {
 
   void endLabeledStatement(int labelCount) {
     Statement statement = popNode();
-    while (labelCount > 0) {
-      Label label = popNode();
-      statement = new LabeledStatement(label, statement);
-      labelCount--;
-    }
-    pushNode(statement);
+    NodeList labels = makeNodeList(labelCount, null, null, null);
+    pushNode(new LabeledStatement(labels, statement));
   }
 
   void log(message) {