Fix the loops break label test with Kernel.

pkg/compiler/lib/src/ssa/loop_handler.dart

 // Copyright (c) 2016, 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.
 
 import 'package:kernel/ast.dart' as ir;
 
 import '../elements/elements.dart' show JumpTarget, LabelDefinition;
 import '../io/source_information.dart';
 import '../tree/tree.dart' as ast;
 
@@ skipping 350 matching lines @@
 
   @override
   JumpHandler createJumpHandler(ir.TreeNode node, {bool isLoopJump}) =>
       builder.createJumpHandler(node, isLoopJump: isLoopJump);
 
   @override
   ast.Node getNode(ir.TreeNode node) => astAdapter.getNode(node);
 
   @override
   JumpTarget getTargetDefinition(ir.TreeNode node) =>
-      astAdapter.getJumpTarget(node.parent);
+      astAdapter.getJumpTarget(node);
 
   @override
   int loopKind(ir.TreeNode node) => node.accept(new _KernelLoopTypeVisitor());
 
   // TODO(het): return the actual source information
   @override
   SourceInformation loopSourceInformation(ir.TreeNode node) => null;
 }
 
 class _KernelLoopTypeVisitor extends ir.Visitor<int> {
@@ skipping 12 matching lines @@
       HLoopBlockInformation.DO_WHILE_LOOP;
 
   @override
   int visitForInStatement(ir.ForInStatement node) =>
       HLoopBlockInformation.FOR_IN_LOOP;
 
   @override
   int visitSwitchStatement(ir.SwitchStatement node) =>
       HLoopBlockInformation.SWITCH_CONTINUE_LOOP;
 }