Temporary workaround for bug 22732.

pkg/compiler/lib/src/ssa/optimize.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.
 
 part of ssa;
 
 abstract class OptimizationPhase {
   String get name;
   void visitGraph(HGraph graph);
 }
@@ skipping 1002 matching lines @@
         return false;
       }
       HInstruction next = current.next;
       if (next == null) {
         // We do not merge blocks in our SSA graph, so if this block just jumps
         // to a single successor, visit the successor, avoiding back-edges.
         HBasicBlock successor;
         if (current is HGoto) {
           successor = current.block.successors.single;
         } else if (current is HIf) {
+          // TODO(paulberry): This variable works around dartbug.com/22732
+          HIf currentHIf = current;
           // We also leave HIf nodes in place when one branch is dead.
           HInstruction condition = current.inputs.first;
           if (condition is HConstant) {
             bool isTrue = condition.constant.isTrue;
-            successor = isTrue ? current.thenBlock : current.elseBlock;
+            successor = isTrue ? currentHIf.thenBlock : currentHIf.elseBlock;
             assert(!analyzer.isDeadBlock(successor));
           }
         }
         if (successor != null && successor.id > current.block.id) {
           next = successor.first;
         }
       }
       current = next;
     } while (current != null);
     return false;
@@ skipping 1164 matching lines @@
 
     keyedValues.forEach((receiver, values) {
       result.keyedValues[receiver] =
           new Map<HInstruction, HInstruction>.from(values);
     });
 
     result.nonEscapingReceivers.addAll(nonEscapingReceivers);
     return result;
   }
 }