Moved zones and zone related stuff in its own directory.

src/zone-allocator.h

-// Copyright 2014 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.
-
-#ifndef V8_ZONE_ALLOCATOR_H_
-#define V8_ZONE_ALLOCATOR_H_
-
-#include <limits>
-
-#include "src/zone.h"
-
-namespace v8 {
-namespace internal {
-
-template<typename T>
-class zone_allocator {
- public:
-  typedef T* pointer;
-  typedef const T* const_pointer;
-  typedef T& reference;
-  typedef const T& const_reference;
-  typedef T value_type;
-  typedef size_t size_type;
-  typedef ptrdiff_t difference_type;
-  template<class O> struct rebind {
-    typedef zone_allocator<O> other;
-  };
-
-  explicit zone_allocator(Zone* zone) throw() : zone_(zone) {}
-  explicit zone_allocator(const zone_allocator& other) throw()
-      : zone_(other.zone_) {}
-  template<typename U> zone_allocator(const zone_allocator<U>& other) throw()
-      : zone_(other.zone_) {}
-  template<typename U> friend class zone_allocator;
-
-  pointer address(reference x) const {return &x;}
-  const_pointer address(const_reference x) const {return &x;}
-
-  pointer allocate(size_type n, const void* hint = 0) {
-    return static_cast<pointer>(zone_->NewArray<value_type>(
-            static_cast<int>(n)));
-  }
-  void deallocate(pointer p, size_type) { /* noop for Zones */ }
-
-  size_type max_size() const throw() {
-    return std::numeric_limits<int>::max() / sizeof(value_type);
-  }
-  void construct(pointer p, const T& val) {
-    new(static_cast<void*>(p)) T(val);
-  }
-  void destroy(pointer p) { p->~T(); }
-
-  bool operator==(zone_allocator const& other) const {
-    return zone_ == other.zone_;
-  }
-  bool operator!=(zone_allocator const& other) const {
-    return zone_ != other.zone_;
-  }
-
-  Zone* zone() { return zone_; }
-
- private:
-  zone_allocator();
-  Zone* zone_;
-};
-
-typedef zone_allocator<bool> ZoneBoolAllocator;
-typedef zone_allocator<int> ZoneIntAllocator;
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_ZONE_ALLOCATOR_H_