!585 x86/speculation: Allow enabling STIBP with legacy IBRS

Merge Pull Request from: @ci-robot 
 
PR sync from:  Wei Li <liwei391@huawei.com>
 https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/thread/UNWNKYXBCMVT2QIU4QPROMO5UMGXKQS7/ 
 
 
Link:https://gitee.com/openeuler/kernel/pulls/585

 

Reviewed-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>