Fix initializer order (build break on some platforms).

runtime/vm/isolate.cc

 // Copyright (c) 2011, 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/isolate.h"
 
 #include "include/dart_api.h"
 
 #include "vm/assert.h"
 #include "vm/bigint_store.h"
@@ skipping 44 matching lines @@
       bigint_store_(NULL),
       top_exit_frame_info_(0),
       init_callback_data_(NULL),
       library_tag_handler_(NULL),
       api_state_(NULL),
       stub_code_(NULL),
       code_index_table_(NULL),
       debugger_(NULL),
       long_jump_base_(NULL),
       timer_list_(),
+      ast_node_id_(AstNode::kNoId),
       mutex_(new Mutex()),
       stack_limit_(0),
-      saved_stack_limit_(0),
-      ast_node_id_(AstNode::kNoId) {
+      saved_stack_limit_(0) {
 }
 
 
 Isolate::~Isolate() {
   delete message_queue_;
   delete heap_;
   delete object_store_;
   // Do not delete stack resources: top_resource_ and current_zone_.
   delete bigint_store_;
   delete api_state_;
@@ skipping 285 matching lines @@
   }
 
   // Visit the top context which is stored in the isolate.
   visitor->VisitPointer(reinterpret_cast<RawObject**>(&top_context_));
 
   // Visit objects in the debugger.
   debugger()->VisitObjectPointers(visitor);
 }
 
 }  // namespace dart