Add support for building patched_sdk and platform.dill for dart2js:

pkg/front_end/lib/src/fasta/kernel/kernel_target.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.
 
 library fasta.kernel_target;
 
 import 'dart:async' show Future;
 
 import 'dart:io' show File, IOSink;
 
@@ skipping 252 matching lines @@
       {bool dumpIr: false, bool verify: false}) async {
     if (loader.first == null) return null;
     if (errors.isNotEmpty) {
       return handleInputError(uri, null, isFullProgram: true);
     }
     try {
       await loader.buildBodies();
       loader.finishStaticInvocations();
       finishAllConstructors();
       loader.finishNativeMethods();
-      transformMixinApplications();
-      // TODO(ahe): Don't call this from two different places.
-      setup_builtin_library.transformProgram(program);
-      otherTransformations();
+      runBuildTransformations();
+
       if (dumpIr) this.dumpIr();
       if (verify) this.verify();
       errors.addAll(loader.collectCompileTimeErrors().map((e) => e.format()));
       if (errors.isNotEmpty) {
         return handleInputError(uri, null, isFullProgram: true);
       }
       if (uri == null) return program;
       return await writeLinkedProgram(uri, program, isFullProgram: true);
     } on InputError catch (e) {
       return handleInputError(uri, e, isFullProgram: true);
@@ skipping 95 matching lines @@
     // elements have a fileUri.
     uriToSource[""] = new Source(<int>[0], const <int>[]);
     Program program = new Program(libraries, uriToSource);
     if (loader.first != null) {
       Builder builder = loader.first.lookup("main", -1, null);
       if (builder is KernelProcedureBuilder) {
         program.mainMethod = builder.procedure;
       }
     }
     if (errors.isEmpty || dillTarget.isLoaded) {
-      setup_builtin_library.transformProgram(program);
+      runLinkTransformations(program);
     }
     ticker.logMs("Linked program");
     return program;
   }
 
   Future<Program> writeLinkedProgram(Uri uri, Program program,
       {bool isFullProgram}) async {
     File output = new File.fromUri(uri);
     IOSink sink = output.openWrite();
     try {
@@ skipping 267 matching lines @@
         if (field.initializer == null) {
           FieldInitializer initializer =
               new FieldInitializer(field, new NullLiteral());
           initializer.parent = constructor;
           constructor.initializers.insert(0, initializer);
         }
       }
     });
   }
 
+  /// Run all transformations that are needed when building a program for the
+  /// first time.
+  void runBuildTransformations() {
+    transformMixinApplications();
+    // TODO(ahe): Don't call this from two different places.
+    setup_builtin_library.transformProgram(program);
+    otherTransformations();
+  }
+
+  /// Run all transformations that are needed when linking a program.
+  void runLinkTransformations(Program program) {
+    setup_builtin_library.transformProgram(program);
+  }
+
   void transformMixinApplications() {
     new MixinFullResolution().transform(program);
     ticker.logMs("Transformed mixin applications");
   }
 
   void otherTransformations() {
     // TODO(ahe): Don't generate type variables in the first place.
     program.accept(new Erasure());
     ticker.logMs("Erased type variables in generic methods");
     // TODO(kmillikin): Make this run on a per-method basis.
@@ skipping 27 matching lines @@
   }
   for (Constructor constructor in superclass.constructors) {
     if (constructor.name.name.isEmpty) {
       return constructor.function.requiredParameterCount == 0
           ? constructor
           : null;
     }
   }
   return null;
 }