Fix debugging module(replace int with intptr_t) so it works on Windows x64.

runtime/bin/dbg_connection_linux.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 "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include <errno.h>  // NOLINT
 #include <stdio.h>  // NOLINT
 #include <stdlib.h>  // NOLINT
@@ skipping 11 matching lines @@
 
 int DebuggerConnectionImpl::epoll_fd_ = -1;
 int DebuggerConnectionImpl::wakeup_fds_[2] = {-1, -1};
 
 
 void DebuggerConnectionImpl::HandleEvent(struct epoll_event* event) {
   if (event->data.fd == DebuggerConnectionHandler::listener_fd_) {
     if (DebuggerConnectionHandler::IsConnected()) {
       FATAL("Cannot connect to more than one debugger.\n");
     }
-    int fd = ServerSocket::Accept(event->data.fd);
+    intptr_t fd = ServerSocket::Accept(event->data.fd);
     if (fd < 0) {
       FATAL("Accepting new debugger connection failed.\n");
     }
     FDUtils::SetBlocking(fd);
     DebuggerConnectionHandler::AcceptDbgConnection(fd);
     // TODO(hausner): add the debugger wire socket fd to the event poll queue
     // once we poll the debugger connection.
   } else if (event->data.fd == wakeup_fds_[0]) {
     // Sync message. Not yet implemented.
     UNIMPLEMENTED();
@@ skipping 78 matching lines @@
 
 
 intptr_t DebuggerConnectionImpl::Receive(intptr_t socket, char* buf, int len) {
   return TEMP_FAILURE_RETRY(read(socket, buf, len));
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)