Split the Kernel transformations into modular and global ones

utils/kernel-service/kernel-service.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 runtime.tools.kernel_service;
 
 // This is an interface to the Dart Kernel parser and Kernel binary generator.
 //
 // It is used by the kernel-isolate to load Dart source code and generate
 // Kernel binary format.
 //
@@ skipping 133 matching lines @@
       declaredVariables: const {});
   DartLoader loader =
       await batch_loader.getLoader(new Repository(), dartOptions);
   var program = loader.loadProgram(fileName, target: target);
 
   var errors = loader.errors;
   if (errors.isNotEmpty) {
     return new CompilationError(loader.errors.toList());
   }
 
-  // Link program into one file, cf. --link option in dartk.
-  target.transformProgram(program);
+  // Perform target-specific transformations.
+  target.performModularTransformations(program);
+  target.performGlobalTransformations(program);
 
   // Write the program to a list of bytes and return it.
   var sink = new DataSink();
   new BinaryPrinter(sink).writeProgramFile(program);
   return new CompilationOk(sink.builder.takeBytes());
 }
 
 Future<CompilationResult> parseScript(DartLoaderBatch loader, Uri fileName,
     String packageConfig, String sdkPath) async {
   try {
@@ skipping 189 matching lines @@
     if (await new File.fromUri(packagesFile).exists()) {
       return packagesFile;
     }
     if (dir.parent.path == dir.path) {
       break;
     }
     dir = dir.parent;
   }
   return null;
 }