Bailout on array optimizations if the array might escape to reflection land.

sdk/lib/_internal/compiler/implementation/inferrer/container_tracer.dart

 // Copyright (c) 2013, 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 type_graph_inferrer;
 
 /**
  * A set of selector names that [List] implements, that we know do not
  * change the element type of the list, or let the list escape to code
  * that might change the element type.
@@ skipping 253 matching lines @@
   bool isClosure(Element element) {
     if (!element.isFunction()) return false;
     Element outermost = element.getOutermostEnclosingMemberOrTopLevel();
     return outermost.declaration != element.declaration;
   }
 
   visitElementTypeInformation(ElementTypeInformation info) {
     if (isClosure(info.element)) {
       bailout('Returned from a closure');
     }
+    if (compiler.backend.isNeededForReflection(info.element)) {
+      bailout('Escape in reflection');
+    }
   }
 }