Add an optional bound to type parameter references

pkg/kernel/lib/binary/ast_from_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_from_binary;
 
 import 'dart:convert';
 import 'dart:typed_data';
 
 import '../ast.dart';
 import '../transformations/flags.dart';
@@ skipping 1066 matching lines @@
         return new FunctionType(positional, returnType,
             typeParameters: typeParameters,
             requiredParameterCount: requiredParameterCount,
             namedParameters: named);
       case Tag.SimpleFunctionType:
         var positional = readDartTypeList();
         var returnType = readDartType();
         return new FunctionType(positional, returnType);
       case Tag.TypeParameterType:
         int index = readUInt();
-        return new TypeParameterType(typeParameterStack[index]);
+        var bound = readDartTypeOption();
+        return new TypeParameterType(typeParameterStack[index], bound);
       default:
         throw fail('Invalid dart type tag: $tag');
     }
   }
 
   List<TypeParameter> readAndPushTypeParameterList(
       [List<TypeParameter> list, TreeNode parent]) {
     int length = readUInt();
     if (length == 0) return list ?? <TypeParameter>[];
     if (list == null) {
@@ skipping 60 matching lines @@
       ..fileOffset = offset
       ..fileEqualsOffset = fileEqualsOffset;
   }
 
   int readOffset() {
     // Offset is saved as unsigned,
     // but actually ranges from -1 and up (thus the -1)
     return readUInt() - 1;
   }
 }