mod_rr            235 nanojit/NativeX64.cpp         emit(rexrb(mod_rr(op, r, b), r, b));
mod_rr            240 nanojit/NativeX64.cpp         emit(rexrb8(mod_rr(op, r, b), r, b));
mod_rr            245 nanojit/NativeX64.cpp         emit(rexprb(mod_rr(op, r, b), r, b));