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

pkg/analyzer2dart/test/sexpr_test.dart

 // 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.
 
 /// Unittest test of the CPS ir generated by the analyzer2dart compiler.
 
 import 'mock_sdk.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/sdk.dart';
 import 'package:analyzer/src/generated/source.dart';
-import 'package:compiler/implementation/cps_ir/cps_ir_nodes_sexpr.dart';
+import 'package:compiler/src/cps_ir/cps_ir_nodes_sexpr.dart';
 import 'package:unittest/unittest.dart';
 
 import '../lib/src/closed_world.dart';
 import '../lib/src/driver.dart';
 import '../lib/src/converted_world.dart';
 import 'output_helper.dart';
 import 'test_helper.dart';
 import 'sexpr_data.dart';
 
 main() {
@@ skipping 14 matching lines @@
   ClosedWorld world = driver.computeWorld(entryPoint);
   ConvertedWorld convertedWorld = convertWorld(world);
   String output = convertedWorld.getIr(convertedWorld.mainFunction)
       .accept(new SExpressionStringifier());
   expect(output, equals(expectedOutput),
       reason: 'Input:\n$input\n'
               'Expected:\n$expectedOutput\n'
               'Actual:\n$output');
 }