Revert "Move dart2js from sdk/lib/_internal/compiler to pkg/compiler"

pkg/compiler/lib/src/helpers/helpers.dart

Index: pkg/compiler/lib/src/helpers/helpers.dart
diff --git a/pkg/compiler/lib/src/helpers/helpers.dart b/pkg/compiler/lib/src/helpers/helpers.dart
deleted file mode 100644
index 097a2227400fefcf823f8b9e8021a21701336951..0000000000000000000000000000000000000000
--- a/pkg/compiler/lib/src/helpers/helpers.dart
+++ /dev/null
@@ -1,95 +0,0 @@
-// Copyright (c) 2014, 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 for debugging helpers. The unittest analyze_unused_test checks that
-/// the helper are not used in production code.
-
-library dart2js.helpers;
-
-import 'dart:async' show EventSink;
-import 'dart:collection';
-import 'dart:convert';
-
-import '../../compiler.dart';
-import '../dart2jslib.dart';
-import '../util/util.dart';
-
-part 'debug_collection.dart';
-part 'trace.dart';
-part 'expensive_map.dart';
-part 'expensive_set.dart';
-part 'stats.dart';
-part 'track_map.dart';
-
-/// Global flag to enable [debugPrint]. This should always be `true` by default
-/// and be set to `false` as a means to temporarily turn off all debugging
-/// printouts.
-const bool DEBUG_PRINT_ENABLED = true;
-
-/// Enables debug mode.
-///
-/// Sets the [DEBUG_MODE] to `true`.
-void enableDebugMode() {
-  DEBUG_MODE = true;
-}
-
-class _DebugIndentation extends Indentation {
-  final String indentationUnit = " ";
-}
-_DebugIndentation _indentation = new _DebugIndentation();
-
-/// Function signature of [debugPrint].
-typedef DebugPrint(s);
-
-/// If [DEBUG_PRINT_ENABLED] is `true` print [s] using the current identation.
-DebugPrint get debugPrint {
-  enableDebugMode();
-  // TODO(johnniwinther): Maybe disable debug mode after the call.
-  return _debugPrint;
-}
-
-/// Implementation of [debugPrint].
-_debugPrint(s) {
-  if (DEBUG_PRINT_ENABLED) print('${_indentation.indentation}$s');
-}
-
-/// Function signature of [debugWrapPrint].
-typedef DebugWrapPrint(s, f());
-
-/// Wraps the call to [f] with a print of 'start:$s' and 'end:$s' incrementing
-/// the current indentation used by [debugPrint] during the execution of [f].
-///
-/// Use this to get a tree-like debug printout for nested calls.
-DebugWrapPrint get debugWrapPrint {
-  enableDebugMode();
-  return _debugWrapPrint;
-}
-
-/// Implementation of [debugWrapPrint].
-DebugWrapPrint _debugWrapPrint(s, f()) {
-  debugPrint('start:$s');
-  var result = _indentation.indentBlock(f);
-  debugPrint('end:$s');
-  return result;
-}
-
-/// Dummy method to mark breakpoints.
-debugBreak() {
-  enableDebugMode();
-}
-
-/// Function signature of [reportHere].
-typedef ReportHere(Compiler compiler, Spannable node, String debugMessage);
-
-/// Print a message with a source location.
-ReportHere get reportHere {
-  enableDebugMode();
-  return _reportHere;
-}
-
-/// Implementation of [reportHere]
-_reportHere(Compiler compiler, Spannable node, String debugMessage) {
-  compiler.reportInfo(node,
-      MessageKind.GENERIC, {'text': 'HERE: $debugMessage'});
-}