VM: Add missing token position in async rethrow

runtime/vm/ast_transformer.cc

 // Copyright (c) 2014, 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.
 
 #include "vm/ast_transformer.h"
 
 #include "vm/object_store.h"
 #include "vm/parser.h"
 #include "vm/thread.h"
 
@@ skipping 189 matching lines @@
   // to determine if a breakpoint is inside an asynchronous function.
   LoadLocalNode* load_async_op = new (Z) LoadLocalNode(token_pos, async_op);
   preamble_->Add(load_async_op);
 
   LoadLocalNode* load_error_param =
       new (Z) LoadLocalNode(token_pos, error_param);
   LoadLocalNode* load_stack_trace_param =
       new (Z) LoadLocalNode(token_pos, stack_trace_param);
   SequenceNode* error_ne_null_branch =
       new (Z) SequenceNode(token_pos, ChainNewScope(preamble_->scope()));
-  error_ne_null_branch->Add(
-      new (Z) ThrowNode(token_pos, load_error_param, load_stack_trace_param));
+  error_ne_null_branch->Add(new (Z) ThrowNode(
+      node->token_pos(), load_error_param, load_stack_trace_param));
   preamble_->Add(new (Z) IfNode(
       token_pos, new (Z) ComparisonNode(
                      token_pos, Token::kNE, load_error_param,
                      new (Z) LiteralNode(token_pos, Object::null_instance())),
       error_ne_null_branch, NULL));
 
   result_ = MakeName(new (Z) LoadLocalNode(token_pos, result_param));
 }
 
 
@@ skipping 285 matching lines @@
 }
 
 
 void AwaitTransformer::VisitThrowNode(ThrowNode* node) {
   AstNode* new_exception = Transform(node->exception());
   result_ = MakeName(
       new (Z) ThrowNode(node->token_pos(), new_exception, node->stacktrace()));
 }
 
 }  // namespace dart