Reintroduce binary to load and save dill file.

runtime/vm/kernel_binary.cc

 // 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.
 #if !defined(DART_PRECOMPILED_RUNTIME)
 
 #include <map>
 #include <vector>
 
 #include "platform/globals.h"
 #include "vm/flags.h"
@@ skipping 877 matching lines @@
   }
 
   fields().ReadFrom<Field>(reader, this);
   procedures().ReadFrom<Procedure>(reader, this);
   return this;
 }
 
 
 void Library::WriteTo(Writer* writer) {
   TRACE_WRITE_OFFSET();
+  writer->WriteFlags(0);
   name_->WriteTo(writer);
   import_uri_->WriteTo(writer);
   writer->WriteUInt(source_uri_index_);
 
   writer->WriteUInt(classes_.length());
   for (int i = 0; i < classes_.length(); i++) {
     Class* klass = classes_[i];
     if (klass->IsNormalClass()) {
       writer->WriteTag(kNormalClass);
       NormalClass::Cast(klass)->WriteTo(writer);
@@ skipping 2046 matching lines @@
 void WritePrecompiledKernel(ByteWriter* byte_writer, kernel::Program* program) {
   ASSERT(byte_writer != NULL);
 
   kernel::Writer writer(byte_writer);
   program->WriteTo(&writer);
 }
 
 
 }  // namespace dart
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)