[Bug gcov-profile/77378] [7 Regression] tree-profile and libgcov assume long long atomic operations are supported

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77378

--- Comment #5 from David Edelsohn <dje at gcc dot gnu.org> ---
Configure might work for multilib libgcov. It's mode dependent (-m32/-m64) in
GCC, so a single configure check is not sufficient.