dart2js: rename folder (stats -> info)

pkg/compiler/lib/src/info/send_info.dart

 // Copyright (c) 2015, 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.
 
-/// Computes statistical data about a program. See `stats.dart` for more details
-/// on the kind of data we collect.
-library compiler.src.stats.stats_builder;
+/// Computes measurements about sends in a function.
+library compiler.src.info.send_info;
 
 import 'dart:convert';
 import 'package:dart2js_info/src/measurements.dart';
 import 'package:dart2js_info/src/util.dart' show recursiveDiagnosticString;
 
 import '../diagnostics/messages.dart' show MessageKind;
 import '../compiler.dart' show Compiler;
 import '../common/tasks.dart' show CompilerTask;
 import '../dart_types.dart';
 import '../closure.dart';
@@ skipping 2354 matching lines @@
   @override
   R visitClosureFieldElement(ClosureFieldElement e, A arg) {
     return visitVariableElement(e, arg);
   }
 }
 
 // TODO(sigmund): get rid of debug messages.
 _debug(String message) {
   print('debug: $message');
 }