Temporary workaround for bug 22732.

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

Index: pkg/compiler/lib/src/ssa/optimize.dart
diff --git a/pkg/compiler/lib/src/ssa/optimize.dart b/pkg/compiler/lib/src/ssa/optimize.dart
index 654cebac035bdb3d7fd3f4e3962b78ea206645a6..70bef1fb317d1bafcf63cf2f011b0e0dbbcf0870 100644
--- a/pkg/compiler/lib/src/ssa/optimize.dart
+++ b/pkg/compiler/lib/src/ssa/optimize.dart
@@ -1020,11 +1020,13 @@ class SsaDeadCodeEliminator extends HGraphVisitor implements OptimizationPhase {
         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));
           }
         }