Add an optional bound to type parameter references

pkg/kernel/lib/binary/ast_to_binary.dart

 // Copyright (c) 2016, 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 kernel.ast_to_binary;
 
 import '../ast.dart';
 import '../import_table.dart';
 import 'tag.dart';
 import 'dart:convert';
 import 'dart:typed_data';
@@ skipping 995 matching lines @@
   }
 
   visitNamedType(NamedType node) {
     writeStringReference(node.name);
     writeNode(node.type);
   }
 
   visitTypeParameterType(TypeParameterType node) {
     writeByte(Tag.TypeParameterType);
     writeUInt30(_typeParameterIndexer[node.parameter]);
+    writeOptionalNode(node.bound);
   }
 
   visitVectorType(VectorType node) {
     writeByte(Tag.VectorType);
   }
 
   visitTypedefType(TypedefType node) {
     writeByte(Tag.TypedefType);
     writeReference(node.typedefReference);
     writeNodeList(node.typeArguments);
@@ skipping 325 matching lines @@
   void flush() {
     _sink.add(_buffer.sublist(0, length));
     _buffer = new Uint8List(SIZE);
     length = 0;
   }
 
   void flushAndDestroy() {
     _sink.add(_buffer.sublist(0, length));
   }
 }