[kernel] Change how TypeParameterType is calculated.

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 1103 matching lines @@
   }
 
   visitNamedType(NamedType node) {
     writeStringReference(node.name);
     writeNode(node.type);
   }
 
   visitTypeParameterType(TypeParameterType node) {
     writeByte(Tag.TypeParameterType);
     writeUInt30(_typeParameterIndexer[node.parameter]);
-    List<TypeParameter> typeParameters =
-        _typeParameterIndexer.indexList[node.parameter];
-    writeUInt30(typeParameters[0].binaryOffset);
-    writeUInt30(typeParameters.indexOf(node.parameter));
     writeOptionalNode(node.promotedBound);
   }
 
   visitVectorType(VectorType node) {
     writeByte(Tag.VectorType);
   }
 
   visitTypedefType(TypedefType node) {
     writeByte(Tag.TypedefType);
     writeReference(node.typedefReference);
@@ skipping 95 matching lines @@
 
   void exit(SwitchStatement node) {
     stackHeight -= node.cases.length;
   }
 
   int operator [](SwitchCase node) => index[node];
 }
 
 class TypeParameterIndexer {
   final Map<TypeParameter, int> index = <TypeParameter, int>{};
-  final Map<TypeParameter, List<TypeParameter>> indexList =
-      <TypeParameter, List<TypeParameter>>{};
   int stackHeight = 0;
 
   void enter(List<TypeParameter> typeParameters) {
     for (var parameter in typeParameters) {
       index[parameter] = stackHeight;
-      indexList[parameter] = typeParameters;
       ++stackHeight;
     }
   }
 
   void exit(List<TypeParameter> typeParameters) {
     stackHeight -= typeParameters.length;
   }
 
   int operator [](TypeParameter parameter) => index[parameter];
 }
@@ skipping 239 matching lines @@
     _sink.add(_buffer.sublist(0, length));
     _buffer = new Uint8List(SIZE);
     flushedLength += length;
     length = 0;
   }
 
   void flushAndDestroy() {
     _sink.add(_buffer.sublist(0, length));
   }
 }