Add source information to variable declarations in CPS.

pkg/compiler/lib/src/tree_ir/tree_ir_nodes.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.
 
 library tree_ir_nodes;
 
 import '../constants/values.dart' as values;
 import '../dart_types.dart' show DartType, InterfaceType, TypeVariableType;
 import '../elements/elements.dart';
 import '../io/source_information.dart' show SourceInformation;
@@ skipping 636 matching lines @@
 
   accept(StatementVisitor visitor) => visitor.visitUnreachable(this);
   accept1(StatementVisitor1 visitor, arg) {
     return visitor.visitUnreachable(this, arg);
   }
 }
 
 class FunctionDefinition extends Node {
   final ExecutableElement element;
   final List<Variable> parameters;
+  final SourceInformation sourceInformation;
   Statement body;
 
   /// Creates a function definition and updates `writeCount` for [parameters].
-  FunctionDefinition(this.element, this.parameters, this.body) {
+  FunctionDefinition(
+      this.element,
+      this.parameters,
+      this.body,
+      {this.sourceInformation}) {
     for (Variable param in parameters) {
       param.writeCount++; // Being a parameter counts as a write.
     }
   }
 }
 
 class CreateBox extends Expression {
   accept(ExpressionVisitor visitor) => visitor.visitCreateBox(this);
   accept1(ExpressionVisitor1 visitor, arg) => visitor.visitCreateBox(this, arg);
 }
@@ skipping 914 matching lines @@
 
   /// Number of uses of the current fallthrough target.
   int get useCount => _stack.last.useCount;
 
   /// Indicate that a statement will fall through to the current fallthrough
   /// target.
   void use() {
     ++_stack.last.useCount;
   }
 }