mark_btf_ld_reg
ret = mark_btf_ld_reg(env, cur_regs(env), value_regno, PTR_TO_BTF_ID,
ret = mark_btf_ld_reg(env, regs, value_regno, ret, reg->btf, btf_id, flag);
ret = mark_btf_ld_reg(env, &map_reg, 0, PTR_TO_BTF_ID,
ret = mark_btf_ld_reg(env, regs, value_regno, ret, btf_vmlinux, btf_id, flag);