Fix generation of a bailout method when a BailoutTarget was in the middle of a loop/labeled block. …

sdk/lib/_internal/compiler/implementation/ssa/bailout.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;
 
 class BailoutInfo {
   int instructionId;
   int bailoutId;
   BailoutInfo(this.instructionId, this.bailoutId);
@@ skipping 716 matching lines @@
     int inputLength = target.inputs.length;
     for (HInstruction input in target.inputs) {
       String inputName = variableNames.getName(input);
       int position = parameterNames[inputName];
       if (position == null) {
         position = parameterNames[inputName] = bailoutArity++;
       }
     }
 
     if (blocks.isEmpty) {
-      if (firstBailoutTarget == null) {
+      // If [currentBlockInformation] is not null, we are in the
+      // middle of a loop/labeled block and this is too complex to handle for
+      // now.
+      if (firstBailoutTarget == null && currentBlockInformation == null) {
         firstBailoutTarget = target;
       } else {
         hasComplexBailoutTargets = true;
       }
     } else {
       hasComplexBailoutTargets = true;
       blocks.forEach((HBasicBlock block) {
         block.bailoutTargets.add(target);
       });
     }
   }
 }