[Bug target/71338] [RL78] mulu instruction not used on G10

[dj at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71338

--- Comment #4 from DJ Delorie <dj at redhat dot com> ---
Sure, the only dependencies might be on binutils/gdb releases, but they support
it and they're independent of gcc releases anyway.