Adding NeedGC() and PerformGC() test inside index performance test
Adding NeedGC() and PerformGC() test inside index performance test

seojungmin/peloton,vittvolt/15721-peloton,seojungmin/peloton,vittvolt/peloton,wangziqi2016/peloton,AngLi-Leon/peloton,AllisonWang/peloton,cmu-db/peloton,AllisonWang/peloton,eric-haibin-lin/peloton-1,ShuxinLin/peloton,vittvolt/peloton,phisiart/peloton-p3,PauloAmora/peloton,eric-haibin-lin/peloton-1,malin1993ml/peloton,haojin2/peloton,cmu-db/peloton,haojin2/peloton,AngLi-Leon/peloton,jessesleeping/iso_peloton,vittvolt/15721-peloton,vittvolt/peloton,AngLi-Leon/peloton,AngLi-Leon/peloton,prashasthip/peloton,AllisonWang/peloton,apavlo/peloton,ShuxinLin/peloton,PauloAmora/peloton,yingjunwu/peloton,PauloAmora/peloton,AngLi-Leon/peloton,ShuxinLin/peloton,prashasthip/peloton,yingjunwu/peloton,seojungmin/peloton,eric-haibin-lin/peloton-1,wangziqi2016/peloton,yingjunwu/peloton,haojin2/peloton,PauloAmora/peloton,eric-haibin-lin/peloton-1,vittvolt/15721-peloton,yingjunwu/peloton,jessesleeping/iso_peloton,vittvolt/15721-peloton,jessesleeping/iso_peloton,prashasthip/peloton,malin1993ml/peloton,malin1993ml/peloton,seojungmin/peloton,ShuxinLin/peloton,PauloAmora/peloton,prashasthip/peloton,haojin2/peloton,malin1993ml/peloton,apavlo/peloton,apavlo/peloton,wangziqi2016/peloton,haojin2/peloton,wangziqi2016/peloton,vittvolt/peloton,jessesleeping/iso_peloton,eric-haibin-lin/peloton-1,phisiart/peloton-p3,wangziqi2016/peloton,apavlo/peloton,malin1993ml/peloton,apavlo/peloton,jessesleeping/iso_peloton,malin1993ml/peloton,cmu-db/peloton,cmu-db/peloton,vittvolt/peloton,vittvolt/15721-peloton,prashasthip/peloton,jessesleeping/iso_peloton,seojungmin/peloton,prashasthip/peloton,phisiart/peloton-p3,AngLi-Leon/peloton,haojin2/peloton,yingjunwu/peloton,vittvolt/peloton,cmu-db/peloton,PauloAmora/peloton,AllisonWang/peloton,AllisonWang/peloton,phisiart/peloton-p3,cmu-db/peloton,vittvolt/15721-peloton,phisiart/peloton-p3,seojungmin/peloton,jessesleeping/iso_peloton,ShuxinLin/peloton,phisiart/peloton-p3,apavlo/peloton,yingjunwu/peloton,wangziqi2016/peloton,eric-haibin-lin/peloton-1,ShuxinLin/peloton,AllisonWang/peloton