[Bug target/55302] [SH] Add support for logical ops with GBR mems

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55302

--- Comment #1 from Oleg Endo <olegendo at gcc dot gnu.org> ---
If the atomic model allows it, the GBR logical ops can also be to implement
atomic operations on GBR relative memory.