Add KernelCodegenWorkItem stub

pkg/compiler/lib/src/source_file_provider.dart

Index: pkg/compiler/lib/src/source_file_provider.dart
diff --git a/pkg/compiler/lib/src/source_file_provider.dart b/pkg/compiler/lib/src/source_file_provider.dart
index 37e3b9d55b3af1bd799c518d7ea27a73b2cf7437..3923829acda0b8173653ac5dd19fbeedb16635fc 100644
--- a/pkg/compiler/lib/src/source_file_provider.dart
+++ b/pkg/compiler/lib/src/source_file_provider.dart
@@ -206,7 +206,9 @@ class FormattingDiagnosticHandler implements CompilerDiagnostics {
       print('${color(message)}');
     } else {
       SourceFile file = provider.sourceFiles[uri];
-      if (file != null) {
+      // TODO(johnniwinther): Remove the '.dill' hack; add support for binary
+      // files to avoid crashes on trying to decode .dill binaries as utf8.
+      if (file != null && !file.filename.endsWith('.dill')) {

[Siggi Cherem (dart-lang), 2017/05/19 20:09:50]

eeek! but ok, I guess... 

         print(file.getLocationMessage(color(message), begin, end,
             colorize: color));
       } else {