Change labeled statement to use visitSubGraph for its body instead of marking its "exit block" spec…

frog/leg/ssa/nodes.dart

 // Copyright (c) 2011, 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 visitBailoutTarget(HBailoutTarget node);
   R visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
   R visitBitOr(HBitOr node);
@@ skipping 704 matching lines @@
     validator.visitBasicBlock(this);
     return validator.isValid;
   }
 }
 
 class HBlockInformation {
   // Just a marker class.
 }
 
 class HLabeledBlockInformation extends HBlockInformation {
-  final HBasicBlock start;
-  final HBasicBlock end;
+  final SubGraph body;
+  final HBasicBlock joinBlock;
   final List<SourceString> labels;
-  HLabeledBlockInformation(this.start, this.end, this.labels);
+  HLabeledBlockInformation(this.body, this.joinBlock, this.labels);
 }
 
 class HLoopInformation extends HBlockInformation {
   final HBasicBlock header;
   final List<HBasicBlock> blocks;
   final List<HBasicBlock> backEdges;
   final List<SourceString> labels;
 
   HLoopInformation(this.header, this.labels)
       : blocks = new List<HBasicBlock>(),
@@ skipping 1543 matching lines @@
 class HIfBlockInformation {
   final HIf branch;
   final SubGraph thenGraph;
   final SubGraph elseGraph;
   final HBasicBlock joinBlock;
   HIfBlockInformation(this.branch,
                       this.thenGraph,
                       this.elseGraph,
                       this.joinBlock);
 }