[Kernel] replace function debuggable field with originalAsyncMarker field

pkg/kernel/lib/analyzer/ast_from_analyzer.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.analyzer.ast_from_analyzer;
 
 import '../ast.dart' as ast;
 import '../frontend/accessors.dart';
 import '../frontend/super_initializers.dart';
 import '../log.dart';
 import '../type_algebra.dart';
@@ skipping 556 matching lines @@
           positional.add(declaration);
           break;
 
         case ParameterKind.NAMED:
           named.add(declaration);
           break;
       }
     }
     int offset = formalParameters?.offset ?? body.offset;
     int endOffset = body.endToken.offset;
+    ast.AsyncMarker asyncMarker = getAsyncMarker(
+        isAsync: body.isAsynchronous, isStar: body.isGenerator);
     return new ast.FunctionNode(buildOptionalFunctionBody(body),
         typeParameters: typeParameters,
         positionalParameters: positional,
         namedParameters: named,
         requiredParameterCount: requiredParameterCount,
         returnType: buildOptionalTypeAnnotation(returnType) ??
             inferredReturnType ??
             const ast.DynamicType(),
-        asyncMarker: getAsyncMarker(
-            isAsync: body.isAsynchronous, isStar: body.isGenerator))
+        asyncMarker: asyncMarker,
+        originalAsyncMarker: asyncMarker)
       ..fileOffset = offset
       ..fileEndOffset = endOffset;
   }
 
   ast.Expression buildOptionalTopLevelExpression(Expression node) {
     return node == null ? null : buildTopLevelExpression(node);
   }
 
   ast.Expression buildTopLevelExpression(Expression node) {
     try {
@@ skipping 2442 matching lines @@
     if (list[i - 1].compareTo(item) == 0) {
       ++deleted;
     } else if (deleted > 0) {
       list[i - deleted] = item;
     }
   }
   if (deleted > 0) {
     list.length -= deleted;
   }
 }