The callers of gossiper::compare_endpoint_startup() need not (should not)
learn of any particular (tagged or untagged) difference of generations;
they only care about the ordering of generations. Change the return type
of compare_endpoint_startup() to "std::strong_ordering", and delegate the
comparison to tagged_tagged_integer::operator<=>.
Signed-off-by: Laszlo Ersek <laszlo.ersek@scylladb.com>
baccbc09c5