[Kernel] replace function debuggable field with originalAsyncMarker field

pkg/kernel/lib/binary/ast_to_binary.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 kernel.ast_to_binary;
 
 import '../ast.dart';
 import '../import_table.dart';
 import 'tag.dart';
 import 'dart:convert';
 import 'dart:typed_data';
@@ skipping 419 matching lines @@
     _variableIndexer.pushScope();
     var oldLabels = _labelIndexer;
     _labelIndexer = new LabelIndexer();
     var oldCases = _switchCaseIndexer;
     _switchCaseIndexer = new SwitchCaseIndexer();
     // Note: FunctionNode has no tag.
     _typeParameterIndexer.enter(node.typeParameters);
     writeOffset(node, node.fileOffset);
     writeOffset(node, node.fileEndOffset);
     writeByte(node.asyncMarker.index);
-    writeByte(node.debuggable ? 1 : 0);
+    writeByte(node.dartAsyncMarker.index);
     writeNodeList(node.typeParameters);
     writeUInt30(node.requiredParameterCount);
     writeVariableDeclarationList(node.positionalParameters);
     writeVariableDeclarationList(node.namedParameters);
     writeNode(node.returnType);
     writeOptionalInferredValue(node.inferredReturnValue);
     writeOptionalNode(node.body);
     _labelIndexer = oldLabels;
     _switchCaseIndexer = oldCases;
     _typeParameterIndexer.exit(node.typeParameters);
@@ skipping 834 matching lines @@
   void flush() {
     _sink.add(_buffer.sublist(0, length));
     _buffer = new Uint8List(SIZE);
     length = 0;
   }
 
   void flushAndDestroy() {
     _sink.add(_buffer.sublist(0, length));
   }
 }