Reapply "Retain types of toplevel and instance variables for reflection."

sdk/lib/_internal/compiler/implementation/js_emitter/class_emitter.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 dart2js.js_emitter;
 
 class ClassEmitter extends CodeEmitterHelper {
   /**
    * Documentation wanted -- johnniwinther
    *
@@ skipping 194 matching lines @@
             }
             int code = getterCode + (setterCode << 2);
             if (code == 0) {
               compiler.reportInternalError(
                   field, 'Internal error: code is 0 ($element/$field)');
             } else {
               buffer.write(FIELD_CODE_CHARACTERS[code - FIRST_FIELD_CODE]);
             }
           }
           if (backend.isAccessibleByReflection(field)) {
-            buffer.write(new String.fromCharCode(REFLECTION_MARKER));
+            buffer.write('-');
+            if (backend.isNeededForReflection(field)) {
+              DartType type = field.computeType(compiler);
+              buffer.write('${task.metadataEmitter.reifyType(type)}');
+            }
           }
         }
       });
     }
 
     bool fieldsAdded = buffer.length > bufferClassLength;
     String compactClassData = buffer.toString();
     jsAst.Expression classDataNode = js.string(compactClassData);
     if (hasMetadata) {
       fieldMetadata.insert(0, classDataNode);
@@ skipping 350 matching lines @@
         ? new Selector.getter(member.name, member.getLibrary())
         : new Selector.setter(member.name, member.getLibrary());
     String reflectionName = task.getReflectionName(selector, name);
     if (reflectionName != null) {
       var reflectable =
           js(backend.isAccessibleByReflection(member) ? '1' : '0');
       builder.addProperty('+$reflectionName', reflectable);
     }
   }
 }