fix build

runtime/vm/isolate.h

 // Copyright (c) 2013, 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_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
@@ skipping 484 matching lines @@
     return value > 0;
   }
 
   void IncrTopLevelParsingCount() {
     AtomicOperations::IncrementBy(&top_level_parsing_count_, 1);
   }
   void DecrTopLevelParsingCount() {
     AtomicOperations::DecrementBy(&top_level_parsing_count_, 1);
   }
 
-  static const uint32_t kInvalidGen = 0;
+  static const intptr_t kInvalidGen = 0;
 
   void IncrFieldInvalidationGen() {
     AtomicOperations::IncrementBy(&field_invalidation_gen_, 1);
     if (field_invalidation_gen_ == kInvalidGen) {
       AtomicOperations::IncrementBy(&field_invalidation_gen_, 1);
     }
   }
   intptr_t field_invalidation_gen() const { return field_invalidation_gen_; }
 
   void IncrLoadingInvalidationGen() {
@@ skipping 397 matching lines @@
   intptr_t* spawn_count_;
 
   Dart_IsolateFlags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_