Make HashMap a template class to specify the allocation policy.

src/zone.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 12 matching lines @@
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #ifndef V8_ZONE_H_
 #define V8_ZONE_H_
 
 #include "allocation.h"
 #include "checks.h"
+#include "hashmap.h"
 #include "globals.h"
 #include "list.h"
 #include "splay-tree.h"
 
 namespace v8 {
 namespace internal {
 
 
 // Zone scopes are in one of two modes.  Either they delete the zone
 // on exit or they do not.
@@ skipping 189 matching lines @@
 // The tree itself and all its elements are allocated in the Zone.
 template <typename Config>
 class ZoneSplayTree: public SplayTree<Config, ZoneListAllocationPolicy> {
  public:
   ZoneSplayTree()
       : SplayTree<Config, ZoneListAllocationPolicy>() {}
   ~ZoneSplayTree();
 };
 
 
+typedef TemplateHashMap<ZoneListAllocationPolicy> ZoneHashMap;
+
 } }  // namespace v8::internal
 
 #endif  // V8_ZONE_H_