Pass SourceInformation through the CPS IR.

pkg/compiler/lib/src/io/code_output.dart

 // Copyright (c) 2012, 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.code_output;
 
 import 'dart:async';
 
 import 'source_information.dart';
 
@@ skipping 23 matching lines @@
 
   /// Returns the number of characters currently write to this output.
   int get length;
 
   /// Returns `true` if this output has been closed.
   bool get isClosed;
 
   /// Closes the output. Further writes will cause a [StateError].
   void close();
 
+  /// Sets the [sourcePosition] for the code next added to this output.
+  void setSourceLocation(SourceLocation sourcePosition);
+
   /// Applies [f] to every marker in this output.
   void forEachSourceLocation(void f(int targetOffset,
                                     SourceLocation sourceLocation));
 }
 
 abstract class AbstractCodeOutput extends CodeOutput {
   List<CodeOutputMarker> markers = new List<CodeOutputMarker>();
   int lastBufferOffset = 0;
   int mappedRangeCounter = 0;
   bool isClosed = false;
@@ skipping 101 matching lines @@
   }
 
   void close() {
     output.close();
     super.close();
     if (_listeners != null) {
       _listeners.forEach((listener) => listener.onDone(length));
     }
   }
 }