[Bug target/112537] Is there a way to disable cpymem pass for rvv

[kito at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112537

--- Comment #8 from Kito Cheng <kito at gcc dot gnu.org> ---
That remind me we may need one option like something -mgeneral-regs-only in
aarch64 and also for target attribute.

BTW, clang has an generic option called -mno-implicit-float can did similar
thing