Begin to compute constant expressions in resolution.

pkg/compiler/lib/src/resolution/registry.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 resolution;
 
 /// [ResolutionRegistry] collects all resolution information. It stores node
 /// related information in a [TreeElements] mapping and registers calls with
 /// [Backend], [World] and [Enqueuer].
 // TODO(johnniwinther): Split this into an interface and implementation class.
@@ skipping 261 matching lines @@
   void setType(Node node, DartType type) => mapping.setType(node, type);
 
   DartType getType(Node node) => mapping.getType(node);
 
   //////////////////////////////////////////////////////////////////////////////
   //  Node-to-Constant mapping functionality.
   //////////////////////////////////////////////////////////////////////////////
 
   ConstantExpression getConstant(Node node) => mapping.getConstant(node);
 
+  void setConstant(Node node, ConstantExpression constant) {
+    mapping.setConstant(node, constant);
+  }
+
   //////////////////////////////////////////////////////////////////////////////
   //  Target/Label functionality.
   //////////////////////////////////////////////////////////////////////////////
 
   /// Register [node] to be the declaration of [label].
   void defineLabel(Label node, LabelDefinition label) {
     mapping.defineLabel(node, label);
   }
 
   /// Undefine the label of [node].
@@ skipping 259 matching lines @@
   }
 
   void registerAsyncMarker(FunctionElement element) {
     backend.registerAsyncMarker(element, world, this);
   }
 
   void registerAsyncForIn(AsyncForIn node) {
     backend.resolutionCallbacks.onAsyncForIn(node, this);
   }
 }