Conditionally add default argument to metadata

pkg/compiler/lib/src/js_emitter/full_emitter/container_builder.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.
 
 library dart2js.js_emitter.full_emitter.container_builder;
 
 import '../../constants/values.dart';
 import '../../elements/elements.dart'
     show Element, MetadataAnnotation, MethodElement;
 import '../../elements/entities.dart';
@@ skipping 125 matching lines @@
       tearOffInfo.add(callSelectorString);
     }
 
     expressions
       ..addAll(tearOffInfo)
       ..add((tearOffName == null || member.isGetter || member.isSetter)
           ? js("null")
           : js.quoteName(tearOffName))
       ..add(js.number(requiredParameterCount))
       ..add(js.number(optionalParameterCount))
-      ..add(memberTypeExpression == null ? js("null") : memberTypeExpression)
-      ..addAll(task.metadataCollector.reifyDefaultArguments(member));
+      ..add(memberTypeExpression == null ? js("null") : memberTypeExpression);
 
     if (canBeReflected || canBeApplied) {
+      expressions.addAll(task.metadataCollector.reifyDefaultArguments(member));
+
       // TODO(redemption): Support entities.
       MethodElement method = member;
       method.functionSignature.forEachParameter((Element parameter) {
         expressions.add(task.metadataCollector.reifyName(parameter.name));
         if (backend.mirrorsData.mustRetainMetadata) {
           Iterable<jsAst.Expression> metadataIndices =
               parameter.metadata.map((MetadataAnnotation annotation) {
             ConstantValue constant =
                 backend.constants.getConstantValueForMetadata(annotation);
             codegenWorldBuilder.addCompileTimeConstantForEmission(constant);
@@ skipping 25 matching lines @@
     jsAst.ArrayInitializer arrayInit =
         new jsAst.ArrayInitializer(expressions.toList());
     compiler.dumpInfoTask
         .registerElementAst(member, builder.addProperty(name, arrayInit));
   }
 
   void addMemberField(Field field, ClassBuilder builder) {
     // For now, do nothing.
   }
 }