[Kernel] replace function debuggable field with originalAsyncMarker field

pkg/kernel/lib/binary/ast_from_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_from_binary;
 
 import '../ast.dart';
 import 'tag.dart';
 import 'loader.dart';
 import 'dart:convert';
 import 'package:kernel/transformations/flags.dart';
@@ skipping 459 matching lines @@
   }
 
   FunctionNode readFunctionNodeOption() {
     return readAndCheckOptionTag() ? readFunctionNode() : null;
   }
 
   FunctionNode readFunctionNode() {
     int offset = readOffset();
     int endOffset = readOffset();
     AsyncMarker asyncMarker = AsyncMarker.values[readByte()];
-    bool debuggable = readByte() == 1 ? true : false;
+    AsyncMarker originalAsyncMarker = AsyncMarker.values[readByte()];
     int typeParameterStackHeight = typeParameterStack.length;
     var typeParameters = readAndPushTypeParameterList();
     var requiredParameterCount = readUInt();
     int variableStackHeight = variableStack.length;
     var positional = readAndPushVariableDeclarationList();
     var named = readAndPushVariableDeclarationList();
     var returnType = readDartType();
     var inferredReturnValue = readOptionalInferredValue();
     int oldLabelStackBase = labelStackBase;
     labelStackBase = labelStack.length;
     var body = readStatementOption();
     labelStackBase = oldLabelStackBase;
     variableStack.length = variableStackHeight;
     typeParameterStack.length = typeParameterStackHeight;
     return new FunctionNode(body,
         typeParameters: typeParameters,
         requiredParameterCount: requiredParameterCount,
         positionalParameters: positional,
         namedParameters: named,
         returnType: returnType,
         inferredReturnValue: inferredReturnValue,
-        asyncMarker: asyncMarker)
+        asyncMarker: asyncMarker,
+        originalAsyncMarker: originalAsyncMarker)
       ..fileOffset = offset
-      ..fileEndOffset = endOffset
-      ..debuggable = debuggable;
+      ..fileEndOffset = endOffset;
   }
 
   void pushVariableDeclaration(VariableDeclaration variable) {
     variableStack.add(variable);
   }
 
   void pushVariableDeclarations(List<VariableDeclaration> variables) {
     variableStack.addAll(variables);
   }
 
@@ skipping 472 matching lines @@
         isFinal: flags & 0x1 != 0,
         isConst: flags & 0x2 != 0)..fileOffset = offset;
   }
 
   int readOffset() {
     // Offset is saved as unsigned,
     // but actually ranges from -1 and up (thus the -1)
     return readUInt() - 1;
   }
 }