[Bug nptl/17629] put all symbols nptl_db looks up in the private namespace

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17629

--- Comment #1 from Pedro Alves <palves at redhat dot com> ---
Actually looks like "stack_used" may be the only one with the problem:

 $ grep -rn DB_GET_SYMBOL -rn
 nptl_db/td_ta_thr_iter.c:157:  err = DB_GET_SYMBOL (list, ta, __stack_user);
 nptl_db/td_ta_thr_iter.c:164:    err = DB_GET_SYMBOL (list, ta, stack_used);
 nptl_db/td_ta_tsd_iter.c:53:  err = DB_GET_SYMBOL (addr, ta, __pthread_keys);
 nptl_db/td_ta_event_addr.c:40:      err = DB_GET_SYMBOL (taddr, ta,
__nptl_create_event);
 nptl_db/td_ta_event_addr.c:44:      err = DB_GET_SYMBOL (taddr, ta,
__nptl_death_event);
 nptl_db/td_thr_validate.c:65:  err = DB_GET_SYMBOL (list, th->th_ta_p,
__stack_user);
 nptl_db/td_thr_validate.c:73:      err = DB_GET_SYMBOL (list, th->th_ta_p,
stack_used);
 nptl_db/td_ta_map_lwp2thr.c:190:  td_err_e err = DB_GET_SYMBOL (list, ta,
__stack_user);
 nptl_db/td_ta_set_event.c:41:  err = DB_GET_SYMBOL (eventmask, ta,
__nptl_threads_events);
 nptl_db/thread_dbP.h:150:#define DB_GET_SYMBOL(var, ta, name)                 
                       \
 nptl_db/td_thr_event_getmsg.c:71:  err = DB_GET_SYMBOL (prevp, th->th_ta_p,
__nptl_last_event);
 nptl_db/td_ta_clear_event.c:41:  err = DB_GET_SYMBOL (eventmask, ta,
__nptl_threads_events);

Though renaming __stack_user to __nptl_stack_user too might be good, in case
other parts of the implementation (e.g., libgcc) might end up defining their
own unrelated static symbols with that name too.

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