Store named parameters in sorted lists instead of using maps.

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 875 matching lines @@
         node.namedParameters.isEmpty) {
       writeByte(Tag.SimpleFunctionType);
       writeNodeList(node.positionalParameters);
       writeNode(node.returnType);
     } else {
       writeByte(Tag.FunctionType);
       _typeParameterIndexer.push(node.typeParameters);
       writeNodeList(node.typeParameters);
       writeUInt30(node.requiredParameterCount);
       writeNodeList(node.positionalParameters);
-      writeList(node.namedParameters.keys.toList(), (String name) {
-        writeStringReference(name);
-        writeNode(node.namedParameters[name]);
-      });
+      writeNodeList(node.namedParameters);
       writeNode(node.returnType);
       _typeParameterIndexer.pop(node.typeParameters);
     }
   }
 
+  visitNamedType(NamedType node) {
+    writeStringReference(node.name);
+    writeNode(node.type);
+  }
+
   visitTypeParameterType(TypeParameterType node) {
     writeByte(Tag.TypeParameterType);
     writeUInt30(_typeParameterIndexer[node.parameter]);
   }
 
   visitTypeParameter(TypeParameter node) {
     writeStringReference(node.name ?? '');
     writeNode(node.bound);
   }
 
@@ skipping 217 matching lines @@
 
   visitSymbolLiteral(SymbolLiteral node) {
     put(node.value);
   }
 
   visitVariableDeclaration(VariableDeclaration node) {
     putOptional(node.name);
     node.visitChildren(this);
   }
 
-  visitFunctionType(FunctionType node) {
-    node.namedParameters.keys.forEach(put);
+  visitNamedType(NamedType node) {
+    put(node.name);
     node.visitChildren(this);
   }
 
   visitTypeParameter(TypeParameter node) {
     putOptional(node.name);
     node.visitChildren(this);
   }
 }
 
 /// Computes and stores the index of a library, class, or member within its
@@ skipping 95 matching lines @@
   void flush() {
     _sink.add(_buffer.sublist(0, length));
     _buffer = new Uint8List(SIZE);
     length = 0;
   }
 
   void flushAndDestroy() {
     _sink.add(_buffer.sublist(0, length));
   }
 }