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

platform/hashmap.cc

 // 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.
 
-#include "bin/hashmap.h"
+#include "platform/hashmap.h"
 
 #include "bin/builtin.h"
 #include "platform/utils.h"
 
 HashMap::HashMap(MatchFun match,
                  uint32_t initial_capacity) {
   match_ = match;
   Initialize(initial_capacity);
 }
 
@@ skipping 165 matching lines @@
   for (Entry* p = map; n > 0; p++) {
     if (p->key != NULL) {
       Lookup(p->key, p->hash, true)->value = p->value;
       n--;
     }
   }
 
   // Delete old map.
   free(map);
 }