deprecate unexploited pseudo-ops, fix SLTI/U zero overwrite
deprecate unexploited pseudo-ops, fix SLTI/U zero overwrite

8l/rsp,mupen64plus/mupen64plus-rsp-cxd4,8l/rsp,mupen64plus/mupen64plus-rsp-cxd4,mupen64plus/mupen64plus-rsp-cxd4,8l/rsp