Fixed zapping of contents

src/zone/accounting-allocator.cc

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/zone/accounting-allocator.h"
 
 #include <cstdlib>
 
 #if V8_LIBC_BIONIC
 #include <malloc.h>  // NOLINT
@@ skipping 11 matching lines @@
     while (current > max) {
       max = base::NoBarrier_CompareAndSwap(&max_memory_usage_, max, current);
     }
   }
   return reinterpret_cast<Segment*>(memory);
 }
 
 void AccountingAllocator::FreeSegment(Segment* memory) {
   base::NoBarrier_AtomicIncrement(
       &current_memory_usage_, -static_cast<base::AtomicWord>(memory->size()));
+  memory->ZapHeader();
   free(memory);
 }
 
 size_t AccountingAllocator::GetCurrentMemoryUsage() const {
   return base::NoBarrier_Load(&current_memory_usage_);
 }
 
 size_t AccountingAllocator::GetMaxMemoryUsage() const {
   return base::NoBarrier_Load(&max_memory_usage_);
 }
 
 }  // namespace internal
 }  // namespace v8