dart2js cps: Direct access on JS arrays.

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

Index: pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart
index 528edc268f3e2ddd8ac62e11d07695463ac71541..e20007188ea40389cbfc4b6e67e0917be91ca588 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart
@@ -340,6 +340,27 @@ class SExpressionStringifier extends Indentation implements Visitor<String> {
         : ' ${access(node.continuation)}';
     return '(JS ${node.type} ${node.codeTemplate} ($arguments)$continuation)';
   }
+
+  @override
+  String visitGetLength(GetLength node) {
+    String object = access(node.object);
+    return '(GetLength $object)';
+  }
+
+  @override
+  String visitGetIndex(GetIndex node) {
+    String object = access(node.object);
+    String index = access(node.index);
+    return '(GetIndex $object $index)';
+  }
+
+  @override
+  String visitSetIndex(SetIndex node) {
+    String object = access(node.object);
+    String index = access(node.index);
+    String value = access(node.value);
+    return '(SetIndex $object $index $value)';
+  }
 }
 
 class ConstantStringifier extends ConstantValueVisitor<String, Null> {