Deletion barrier: Distinguish+verify field initialization in ia32 generated code.

runtime/vm/scavenger.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_SCAVENGER_H_
 #define VM_SCAVENGER_H_
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/dart.h"
@@ skipping 43 matching lines @@
 
  private:
   explicit SemiSpace(VirtualMemory* reserved);
   ~SemiSpace();
 
   VirtualMemory* reserved_;  // NULL for an emtpy space.
   MemoryRegion region_;
 
   static SemiSpace* cache_;
   static Mutex* mutex_;
-
-#ifdef DEBUG
-  static const intptr_t kZapValue = 0xf3;
-#endif
 };
 
 
 // Statistics for a particular scavenge.
 class ScavengeStats {
  public:
   ScavengeStats() {}
   ScavengeStats(int64_t start_micros,
                 int64_t end_micros,
                 SpaceUsage before,
@@ skipping 239 matching lines @@
 
   friend class ScavengerVisitor;
   friend class ScavengerWeakVisitor;
 
   DISALLOW_COPY_AND_ASSIGN(Scavenger);
 };
 
 }  // namespace dart
 
 #endif  // VM_SCAVENGER_H_