dart2js cps: Use definitions by default, not references.

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

 // Copyright (c) 2013, 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.
 
 library dart2js.ir_builder;
 
 import '../closure.dart' as closure;
 import '../common.dart';
 import '../common/names.dart' show
     Names,
@@ skipping 325 matching lines @@
     for (int jumpIndex = 0; jumpIndex < _invocations.length; ++jumpIndex) {
       Environment invocationEnvironment = _invocationEnvironments[jumpIndex];
       List<ir.Reference> arguments = <ir.Reference>[];
       int varIndex = 0;
       for (ir.Parameter parameter in parameters) {
         varIndex =
             _continuationEnvironment.index2value.indexOf(parameter, varIndex);
         arguments.add(new ir.Reference(invocationEnvironment[varIndex]));
       }
       ir.InvokeContinuation invocation = _invocations[jumpIndex];
-      invocation.continuation = new ir.Reference(_continuation);
-      invocation.arguments = arguments;
+      invocation.continuationRef = new ir.Reference(_continuation);
+      invocation.argumentRefs = arguments;
     }
   }
 }
 
 /// A class to collect 'backward' jumps.
 ///
 /// A backward jump to a continuation in the sense of the CPS translation is
 /// a jump where some code in the body of the continuation is translated
 /// before the jump is emitted.  They have the property that the
 /// continuation parameters and the environment for the translation of the
@@ skipping 2579 matching lines @@
                    this.stackTraceVariable,
                    this.buildCatchBlock});
 }
 
 class SwitchCaseInfo {
   final SubbuildFunction buildCondition;
   final SubbuildFunction buildBody;
 
   SwitchCaseInfo(this.buildCondition, this.buildBody);
 }