update copyright dates

From-SVN: r151359

include/demangle.h

 /* Defs for interface to demanglers.
    Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2002,
-   2003, 2004, 2005, 2007 Free Software Foundation, Inc.
+   2003, 2004, 2005, 2007, 2008, 2009 Free Software Foundation, Inc.
    
    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public License

include/hashtab.h

 /* An expandable hash tables datatype.  
-   Copyright (C) 1999, 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2000, 2002, 2003, 2004, 2005, 2009
+   Free Software Foundation, Inc.
    Contributed by Vladimir Makarov (vmakarov@cygnus.com).
 
 This program is free software; you can redistribute it and/or modify

include/splay-tree.h

 /* A splay-tree datatype.  
-   Copyright 1998, 1999, 2000, 2002, 2007 Free Software Foundation, Inc.
+   Copyright 1998, 1999, 2000, 2002, 2005, 2007, 2009
+   Free Software Foundation, Inc.
    Contributed by Mark Mitchell (mark@markmitchell.com).
 
    This file is part of GCC.