[Bug driver/124212] jobserver token isn't preserved

[sjames at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124212

--- Comment #1 from Sam James <sjames at gcc dot gnu.org> ---
(This isn't completely academic, as we have at least one jobserver impl that
cares about the token and wants to use it for accounting, and currently warns
on a mismatch.)