This reduces code size and dependencies on ld.so internals from
libc.so.
Fixes commit f4c142bb9f
("arm: Use _dl_find_object on __gnu_Unwind_Find_exidx (BZ 31405)").
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
(cherry picked from commit 96429bcc91)