Don't recreate CoreTypes in transformers. Pass it in.

pkg/kernel/bin/transform.dart

 #!/usr/bin/env dart
 // Copyright (c) 2016, 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 'dart:io';
 
 import 'package:args/args.dart';
+import 'package:kernel/core_types.dart';
 import 'package:kernel/kernel.dart';
 import 'package:kernel/transformations/closure_conversion.dart' as closures;
 import 'package:kernel/transformations/continuation.dart' as cont;
 import 'package:kernel/transformations/empty.dart' as empty;
 import 'package:kernel/transformations/method_call.dart' as method_call;
 import 'package:kernel/transformations/mixin_full_resolution.dart' as mix;
 import 'package:kernel/transformations/treeshaker.dart' as treeshaker;
 import 'package:kernel/verifier.dart';
 
 import 'batch_util.dart';
@@ skipping 47 matching lines @@
   if (output == null) {
     output = '${input.substring(0, input.lastIndexOf('.'))}.transformed.dill';
   }
 
   List<String> embedderEntryPointManifests =
       options['embedder-entry-points-manifest'] as List<String>;
   List<treeshaker.ProgramRoot> programRoots =
       parseProgramRoots(embedderEntryPointManifests);
 
   var program = loadProgramFromBinary(input);
+  var coreTypes = new CoreTypes(program);
   switch (options['transformation']) {
     case 'continuation':
-      program = cont.transformProgram(program);
+      program = cont.transformProgram(coreTypes, program);
       break;
     case 'resolve-mixins':
-      program = mix.transformProgram(program);
+      program = mix.transformProgram(coreTypes, program);
       break;
     case 'closures':
-      program = closures.transformProgram(program);
+      program = closures.transformProgram(coreTypes, program);
       break;
     case 'treeshake':
-      program =
-          treeshaker.transformProgram(program, programRoots: programRoots);
+      program = treeshaker.transformProgram(coreTypes, program,
+          programRoots: programRoots);
       break;
     case 'methodcall':
-      program = method_call.transformProgram(program);
+      program = method_call.transformProgram(coreTypes, program);
       break;
     case 'empty':
       program = empty.transformProgram(program);
       break;
     default:
       throw 'Unknown transformation';
   }
 
   verifyProgram(program);
 
   if (format == 'text') {
     writeProgramToText(program, path: output);
   } else {
     assert(format == 'bin');
     await writeProgramToBinary(program, output);
   }
 
   if (verbose) {
     writeLibraryToText(program.mainMethod.parent as Library);
   }
 
   return CompilerOutcome.Ok;
 }