[Bug libstdc++/123211] Consider specializing ranges::distance for join_view

[barry.revzin at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123211

--- Comment #2 from Barry Revzin <barry.revzin at gmail dot com> ---
While I'm listing things, distance(r | reverse) is just distance(r).