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

bin/eventhandler_macos.h

 // 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_EVENTHANDLER_MACOS_H_
 #define BIN_EVENTHANDLER_MACOS_H_
 
 #if !defined(BIN_EVENTHANDLER_H_)
 #error Do not include eventhandler_macos.h directly; use eventhandler.h instead.
 #endif
 
 #include <unistd.h>
 #include <sys/socket.h>
 
-#include "bin/hashmap.h"
+#include "platform/hashmap.h"
 
 class InterruptMessage {
  public:
   intptr_t id;
   Dart_Port dart_port;
   int64_t data;
 };
 
 
 enum PortDataFlags {
@@ skipping 99 matching lines @@
   HashMap socket_map_;
   int64_t timeout_;  // Time for next timeout.
   Dart_Port timeout_port_;
   bool shutdown_;
   int interrupt_fds_[2];
   int kqueue_fd_;
 };
 
 
 #endif  // BIN_EVENTHANDLER_MACOS_H_