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

runtime/bin/dbg_connection_linux.cc

Index: runtime/bin/dbg_connection_linux.cc
===================================================================
--- runtime/bin/dbg_connection_linux.cc	(revision 37971)
+++ runtime/bin/dbg_connection_linux.cc	(working copy)
@@ -29,7 +29,7 @@
     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");
     }