dart2js cps: Introduce GetStatic/SetStatic.

pkg/compiler/lib/src/tree_ir/optimization/statement_rewriter.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of tree_ir.optimization;
 
 /**
  * Performs the following transformations on the tree:
  * - Assignment inlining
  * - Assignment expression propagation
@@ skipping 575 matching lines @@
     node.value = visitExpression(node.value);
     node.object = visitExpression(node.object);
     return node;
   }
 
   Expression visitGetField(GetField node) {
     node.object = visitExpression(node.object);
     return node;
   }
 
+  Expression visitGetStatic(GetStatic node) {
+    return node;
+  }
+
+  Expression visitSetStatic(SetStatic node) {
+    node.value = visitExpression(node.value);
+    return node;
+  }
+
   Expression visitCreateBox(CreateBox node) {
     return node;
   }
 
   Expression visitCreateInstance(CreateInstance node) {
     for (int i = node.arguments.length - 1; i >= 0; --i) {
       node.arguments[i] = visitExpression(node.arguments[i]);
     }
     return node;
   }
@@ skipping 319 matching lines @@
 }
 
 /// Result of combining two expressions that do not affect reference counting.
 class GenericCombinedExpressions implements CombinedExpressions {
   Expression combined;
 
   GenericCombinedExpressions(this.combined);
 
   void uncombine() {}
 }