[Bug gcov-profile/95480] GCOV change breaks AIX build

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95480

--- Comment #2 from David Edelsohn <dje at gcc dot gnu.org> ---
$ nm -BCpg libgcov-merge-tool.o | grep _8    
         - U .__atomic_fetch_add_8
         - U .__sync_val_compare_and_swap_8