Enable await in while and do-while.

runtime/vm/flow_graph_builder.h

 // Copyright (c) 2012, 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.
 
 #ifndef VM_FLOW_GRAPH_BUILDER_H_
 #define VM_FLOW_GRAPH_BUILDER_H_
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 #include "vm/allocation.h"
@@ skipping 320 matching lines @@
   // parts are reachable.  Assumes this graph is open.
   void Join(const TestGraphVisitor& test_fragment,
             const EffectGraphVisitor& true_fragment,
             const EffectGraphVisitor& false_fragment);
 
   // Append a 'while loop' test and back edge to this graph, depending on
   // which parts are reachable.  Afterward, the graph exit is the false
   // successor of the loop condition.
   void TieLoop(intptr_t token_pos,
                const TestGraphVisitor& test_fragment,
-               const EffectGraphVisitor& body_fragment);
+               const EffectGraphVisitor& body_fragment,
+               const EffectGraphVisitor& test_preamble_fragment);
 
   // Wraps a value in a push-argument instruction and adds the result to the
   // graph.
   PushArgumentInstr* PushArgument(Value* value);
 
   // This implementation shares state among visitors by using the builder.
   // The implementation is incorrect if a visitor that hits a return is not
   // actually added to the graph.
   void AddReturnExit(intptr_t token_pos, Value* value);
 
@@ skipping 251 matching lines @@
   // Output parameters.
   GrowableArray<TargetEntryInstr**> true_successor_addresses_;
   GrowableArray<TargetEntryInstr**> false_successor_addresses_;
 
   intptr_t condition_token_pos_;
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_BUILDER_H_