util: Reduce allocation.
util: Reduce allocation.

EvilMcJerkface/tidb,zimulala/tidb,mccxj/tidb,astaxie/tidb,kyle-wang/tidb,louishust/tidb,liyu4/tidb,gaocegege/tidb,andelf/tidb,coocood/tidb,ueizhou/tidb,XuHuaiyu/tidb,anywhy/tidb,yuanwhy/tidb,zs634134578/tidb,kyle-wang/tidb,c4pt0r/tidb,kyle-wang/tidb,yangwenmai/tidb,pingcap/tidb,ngaut/tidb,pingcap/tidb,cosmtrek/tidb,Nify/tidb,ngaut/tidb,coocood/tidb,zs634134578/tidb,XuHuaiyu/tidb,kyle-wang/tidb,liyu4/tidb,wusphinx/tidb,spongedu/tidb,JinheLin/tidb,c4pt0r/tidb,Cofyc/tidb,yuanwhy/tidb,anywhy/tidb,pingcap/tidb,louishust/tidb,zimulala/tidb,ngaut/tidb,andelf/tidb,EvilMcJerkface/tidb,simon-xia/tidb,gaocegege/tidb,ngaut/tidb,silentred/tidb,JinheLin/tidb,ueizhou/tidb,astaxie/tidb,ming-relax/tidb,ming-relax/tidb,c4pt0r/tidb,wusphinx/tidb,mccxj/tidb,myrice/tidb,pingcap/tidb,CodeRushing/tidb,silenceper/tidb,tiancaiamao/tidb,8cbx/tidb,qhsong/tidb,c4pt0r/tidb,myrice/tidb,pingcap/tidb,simon-xia/tidb,Nify/tidb,cosmtrek/tidb,qhsong/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,c4pt0r/tidb,tiancaiamao/tidb,qiuyesuifeng/tidb,spongedu/tidb,silentred/tidb,ngaut/tidb,CodeRushing/tidb,8cbx/tidb,qiuyesuifeng/tidb,yangwenmai/tidb,Cofyc/tidb,kyle-wang/tidb,pingcap/tidb,silenceper/tidb