Add source mapping info to loops.

lib/compiler/implementation/ssa/nodes.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.
 
 interface HVisitor<R> {
   R visitAdd(HAdd node);
   R visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
   R visitBitOr(HBitOr node);
   R visitBitXor(HBitXor node);
@@ skipping 2529 matching lines @@
   static final int FOR_IN_LOOP = 3;
   static final int NOT_A_LOOP = -1;
 
   final int kind;
   final HExpressionInformation initializer;
   final HExpressionInformation condition;
   final HStatementInformation body;
   final HExpressionInformation updates;
   final TargetElement target;
   final List<LabelElement> labels;
+  final Node sourcePosition;
 
   HLoopBlockInformation(this.kind,
                         this.initializer,
                         this.condition,
                         this.body,
                         this.updates,
                         this.target,
-                        this.labels);
+                        this.labels,
+                        this.sourcePosition);
 
   HBasicBlock get start() {
     if (initializer !== null) return initializer.start;
     if (kind == DO_WHILE_LOOP) {
       return body.start;
     }
     return condition.start;
   }
 
   HBasicBlock get loopHeader() {
@@ skipping 90 matching lines @@
   HBasicBlock get start() => expression.start;
   HBasicBlock get end() {
     // We don't create a switch block if there are no cases.
     assert(!statements.isEmpty());
     return statements.last().end;
   }
 
   bool accept(HStatementInformationVisitor visitor) =>
       visitor.visitSwitchInfo(this);
 }