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

tests/compiler/dart2js/type_checker_test.dart

 // Copyright (c) 2011, 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.
 
 import 'dart:async';
 import 'package:async_helper/async_helper.dart';
 import 'package:expect/expect.dart';
-import 'package:compiler/implementation/elements/elements.dart';
-import 'package:compiler/implementation/tree/tree.dart';
-import 'package:compiler/implementation/util/util.dart';
-import 'package:compiler/implementation/source_file.dart';
+import 'package:compiler/src/elements/elements.dart';
+import 'package:compiler/src/tree/tree.dart';
+import 'package:compiler/src/util/util.dart';
+import 'package:compiler/src/source_file.dart';
 import 'mock_compiler.dart';
 import 'parser_helper.dart';
 
-import 'package:compiler/implementation/elements/modelx.dart'
+import 'package:compiler/src/elements/modelx.dart'
   show ClassElementX, CompilationUnitElementX, ElementX, FunctionElementX;
 
-import 'package:compiler/implementation/dart2jslib.dart';
+import 'package:compiler/src/dart2jslib.dart';
 
-import 'package:compiler/implementation/dart_types.dart';
+import 'package:compiler/src/dart_types.dart';
 
 final MessageKind NOT_ASSIGNABLE = MessageKind.NOT_ASSIGNABLE;
 final MessageKind MEMBER_NOT_FOUND = MessageKind.MEMBER_NOT_FOUND;
 
 main() {
   List tests = [testSimpleTypes,
                 testReturn,
                 testFor,
                 testWhile,
                 testTry,
@@ skipping 2084 matching lines @@
   parser.parseStatement(tokens);
   Node node = listener.popNode();
   TreeElements elements = compiler.resolveNodeStatement(node, element);
   TypeCheckerVisitor checker = new TypeCheckerVisitor(
       compiler, elements, compiler.types);
   compiler.clearMessages();
   checker.analyze(node);
   generateOutput(compiler, text);
   compareWarningKinds(text, expectedWarnings, compiler.warnings);
 }