[Kernel] replace function debuggable field with originalAsyncMarker field

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 "platform/globals.h"
 #include "vm/flags.h"
 #include "vm/growable_array.h"
 #include "vm/kernel.h"
 #include "vm/kernel_to_il.h"
@@ skipping 1883 matching lines @@
 
 FunctionNode* FunctionNode::ReadFrom(Reader* reader) {
   TRACE_READ_OFFSET();
   TypeParameterScope<ReaderHelper> scope(reader->helper());
 
   FunctionNode* function = new FunctionNode();
   function->position_ = reader->ReadPosition();
   function->end_position_ = reader->ReadPosition();
   function->async_marker_ =
       static_cast<FunctionNode::AsyncMarker>(reader->ReadByte());
-  function->debuggable_ = reader->ReadByte() == 1 ? true : false;
+  function->original_async_marker_ =
+      static_cast<FunctionNode::AsyncMarker>(reader->ReadByte());
   function->type_parameters().ReadFrom(reader);
   function->required_parameter_count_ = reader->ReadUInt();
   function->positional_parameters().ReadFromStatic<VariableDeclarationImpl>(
       reader);
   function->named_parameters().ReadFromStatic<VariableDeclarationImpl>(reader);
   function->return_type_ = DartType::ReadFrom(reader);
   function->inferred_return_value_ = reader->ReadOptional<InferredValue>();
 
   LabelScope<ReaderHelper, BlockStack<LabeledStatement> > labels(
       reader->helper());
@@ skipping 16 matching lines @@
 
 kernel::Program* ReadPrecompiledKernelFromBuffer(const uint8_t* buffer,
                                                  intptr_t buffer_length) {
   kernel::Reader reader(buffer, buffer_length);
   return kernel::Program::ReadFrom(&reader);
 }
 
 
 }  // namespace dart
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)