Add NoSafepointScope to ObjectPointerVisitor.

runtime/vm/heap.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_HEAP_H_
 #define VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
@@ skipping 315 matching lines @@
   bool gc_in_progress_;
 
   int pretenure_policy_;
 
   friend class ServiceEvent;
   friend class PageSpace;  // VerifyGC
   DISALLOW_COPY_AND_ASSIGN(Heap);
 };
 
 
-// Within a NoSafepointScope, the thread must not reach any safepoint. Used
-// around code that manipulates raw object pointers directly without handles.
-#if defined(DEBUG)
-class NoSafepointScope : public StackResource {
- public:
-  NoSafepointScope();
-  ~NoSafepointScope();
- private:
-  DISALLOW_COPY_AND_ASSIGN(NoSafepointScope);
-};
-#else  // defined(DEBUG)
-class NoSafepointScope : public ValueObject {
- public:
-  NoSafepointScope() {}
- private:
-  DISALLOW_COPY_AND_ASSIGN(NoSafepointScope);
-};
-#endif  // defined(DEBUG)
-
-
 class HeapIterationScope : public StackResource {
  public:
   HeapIterationScope();
   ~HeapIterationScope();
  private:
   NoSafepointScope no_safepoint_scope_;
   PageSpace* old_space_;
 
   DISALLOW_COPY_AND_ASSIGN(HeapIterationScope);
 };
 
 
 class NoHeapGrowthControlScope : public StackResource {
  public:
   NoHeapGrowthControlScope();
   ~NoHeapGrowthControlScope();
  private:
   bool current_growth_controller_state_;
   DISALLOW_COPY_AND_ASSIGN(NoHeapGrowthControlScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_