emit_jmp_r
void emit_jmp_r(struct jit_context *ctx, u8 dst, u8 src, s32 off, u8 op);
emit_jmp_r(ctx, lo(dst), lo(src), rel, jmp);
emit_jmp_r(ctx, lo(dst), MIPS_R_T6, rel, jmp);
emit_jmp_r(ctx, dst, MIPS_R_T4, rel, jmp);
emit_jmp_r(ctx, MIPS_R_T4, MIPS_R_T5, rel, jmp);
emit_jmp_r(ctx, MIPS_R_T4, MIPS_R_T5, rel, jmp);
emit_jmp_r(ctx, dst, src, rel, jmp);