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

tests/compiler/dart2js/type_equals_test.dart

 // Copyright (c) 2012, 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 "package:expect/expect.dart";
 import "package:async_helper/async_helper.dart";
-import 'package:compiler/implementation/dart_types.dart';
+import 'package:compiler/src/dart_types.dart';
 import "compiler_helper.dart";
 import "parser_helper.dart";
 
 bool test(compiler, String name1, String name2, {bool expect}) {
   Expect.isTrue((expect != null), 'required parameter "expect" not given');
   var clazz = findElement(compiler, "Class");
   clazz.ensureResolved(compiler);
   var element1 = clazz.buildScope().lookup(name1);
   var element2 = clazz.buildScope().lookup(name2);
   Expect.isNotNull(element1);
@@ skipping 90 matching lines @@
     test(compiler, "ListInt1", "ListString1", expect: false);
     test(compiler, "ListString1", "MapIntString1", expect: false);
     test(compiler, "MapIntString1", "TypeVar1", expect: false);
     test(compiler, "TypeVar1", "Function1a", expect: false);
     test(compiler, "Function1a", "Function1b", expect: false);
     test(compiler, "Function1b", "Typedef1a", expect: false);
     test(compiler, "Typedef1a", "Typedef1b", expect: false);
     test(compiler, "Typedef1b", "Typedef1c", expect: false);
   }));
 }