improved thread id reporting

[Eli Zaretskii]

> From: Thiago Jung Bauermann <bauerman@br.ibm.com>
> Cc: gdb@sourceware.org
> Date: Sat, 04 Apr 2009 16:07:45 -0300
> 
> El sáb, 04-04-2009 a las 11:46 -0700, Doug Evans escribió:
> > Comments?
> 
> I like it.

So do I.