dart2js cps: Introduce GetStatic/SetStatic.

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 c330117d32beedb69c42ee101f8a1a2a91235291..5cc52ced04083a849c57b64eb39e1d78d6f57f83 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
@@ -335,6 +335,18 @@ class SExpressionStringifier extends Indentation implements Visitor<String> {
     return '(GetField $object $field)';
   }
 
+  String visitGetStatic(GetStatic node) {
+    String element = node.element.name;
+    return '(GetStatic $element)';
+  }
+
+  String visitSetStatic(SetStatic node) {
+    String element = node.element.name;
+    String value = access(node.value);
+    String body = indentBlock(() => visit(node.body));
+    return '$indentation(SetStatic $element $value\n$body)';
+  }
+
   String visitCreateBox(CreateBox node) {
     return '(CreateBox)';
   }