Moved zones and zone related stuff in its own directory.

src/base/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/base/accounting-allocator.h"
-
-#include <cstdlib>
-
-#if V8_LIBC_BIONIC
-#include <malloc.h>  // NOLINT
-#endif
-
-namespace v8 {
-namespace base {
-
-void* AccountingAllocator::Allocate(size_t bytes) {
-  void* memory = malloc(bytes);
-  if (memory) {
-    AtomicWord current =
-        NoBarrier_AtomicIncrement(&current_memory_usage_, bytes);
-    AtomicWord max = NoBarrier_Load(&max_memory_usage_);
-    while (current > max) {
-      max = NoBarrier_CompareAndSwap(&max_memory_usage_, max, current);
-    }
-  }
-  return memory;
-}
-
-void AccountingAllocator::Free(void* memory, size_t bytes) {
-  free(memory);
-  NoBarrier_AtomicIncrement(&current_memory_usage_,
-                            -static_cast<AtomicWord>(bytes));
-}
-
-size_t AccountingAllocator::GetCurrentMemoryUsage() const {
-  return NoBarrier_Load(&current_memory_usage_);
-}
-
-size_t AccountingAllocator::GetMaxMemoryUsage() const {
-  return NoBarrier_Load(&max_memory_usage_);
-}
-
-}  // namespace base
-}  // namespace v8