Move hashmap.h and hashmap.cc from the 'bin' directory to 'platform' directory so that it can be us…

bin/hashmap.h

Index: bin/hashmap.h
===================================================================
--- bin/hashmap.h	(revision 10251)
+++ bin/hashmap.h	(working copy)
@@ -1,76 +0,0 @@
-// 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 BIN_HASHMAP_H_
-#define BIN_HASHMAP_H_
-
-#include "platform/globals.h"
-
-class HashMap {
- public:
-  typedef bool (*MatchFun) (void* key1, void* key2);
-
-  static bool SamePointerValue(void* key1, void* key2) {
-    return key1 == key2;
-  }
-
-  // initial_capacity is the size of the initial hash map;
-  // it must be a power of 2 (and thus must not be 0).
-  HashMap(MatchFun match, uint32_t initial_capacity);
-
-  ~HashMap();
-
-  // HashMap entries are (key, value, hash) triplets.
-  // Some clients may not need to use the value slot
-  // (e.g. implementers of sets, where the key is the value).
-  struct Entry {
-    void* key;
-    void* value;
-    uint32_t hash;  // The full hash value for key.
-  };
-
-  // If an entry with matching key is found, Lookup()
-  // returns that entry. If no matching entry is found,
-  // but insert is set, a new entry is inserted with
-  // corresponding key, key hash, and NULL value.
-  // Otherwise, NULL is returned.
-  Entry* Lookup(void* key, uint32_t hash, bool insert);
-
-  // Removes the entry with matching key.
-  void Remove(void* key, uint32_t hash);
-
-  // Empties the hash map (occupancy() == 0).
-  void Clear();
-
-  // The capacity of the table. The implementation
-  // makes sure that occupancy is at most 80% of
-  // the table capacity.
-  intptr_t capacity() const { return capacity_; }
-
-  // Iteration
-  //
-  // for (Entry* p = map.Start(); p != NULL; p = map.Next(p)) {
-  //   ...
-  // }
-  //
-  // If entries are inserted during iteration, the effect of
-  // calling Next() is undefined.
-  Entry* Start() const;
-  Entry* Next(Entry* p) const;
-
- private:
-  MatchFun match_;
-  Entry* map_;
-  uint32_t capacity_;
-  uint32_t occupancy_;
-
-  Entry* map_end() const { return map_ + capacity_; }
-  Entry* Probe(void* key, uint32_t hash);
-  void Initialize(uint32_t capacity);
-  void Resize();
-
-  friend class IntSet;  // From hashmap_test.cc
-};
-
-#endif  // BIN_HASHMAP_H_