Fix String tests on netfx (#17767)
Fix String tests on netfx (#17767)


billwert/corefx,ptoonen/corefx,Petermarcu/corefx,gkhanna79/corefx,ericstj/corefx,nbarbettini/corefx,YoupHulsebos/corefx,gkhanna79/corefx,ericstj/corefx,nbarbettini/corefx,axelheer/corefx,weltkante/corefx,Ermiar/corefx,mmitche/corefx,rubo/corefx,ravimeda/corefx,rubo/corefx,twsouthwick/corefx,wtgodbe/corefx,billwert/corefx,tijoytom/corefx,the-dwyer/corefx,stone-li/corefx,the-dwyer/corefx,Petermarcu/corefx,krytarowski/corefx,stone-li/corefx,jlin177/corefx,DnlHarvey/corefx,yizhang82/corefx,BrennanConroy/corefx,rahku/corefx,Jiayili1/corefx,fgreinacher/corefx,Petermarcu/corefx,seanshpark/corefx,richlander/corefx,ericstj/corefx,parjong/corefx,yizhang82/corefx,cydhaselton/corefx,alexperovich/corefx,axelheer/corefx,YoupHulsebos/corefx,ViktorHofer/corefx,mazong1123/corefx,richlander/corefx,DnlHarvey/corefx,yizhang82/corefx,mazong1123/corefx,BrennanConroy/corefx,nbarbettini/corefx,stephenmichaelf/corefx,cydhaselton/corefx,rahku/corefx,rahku/corefx,alexperovich/corefx,wtgodbe/corefx,tijoytom/corefx,seanshpark/corefx,Petermarcu/corefx,seanshpark/corefx,fgreinacher/corefx,ravimeda/corefx,tijoytom/corefx,ravimeda/corefx,rjxby/corefx,parjong/corefx,zhenlan/corefx,nbarbettini/corefx,BrennanConroy/corefx,elijah6/corefx,MaggieTsang/corefx,Ermiar/corefx,jlin177/corefx,billwert/corefx,krytarowski/corefx,seanshpark/corefx,yizhang82/corefx,ViktorHofer/corefx,zhenlan/corefx,JosephTremoulet/corefx,stephenmichaelf/corefx,nbarbettini/corefx,ravimeda/corefx,YoupHulsebos/corefx,rjxby/corefx,richlander/corefx,tijoytom/corefx,dhoehna/corefx,yizhang82/corefx,Petermarcu/corefx,krk/corefx,parjong/corefx,JosephTremoulet/corefx,ptoonen/corefx,stone-li/corefx,alexperovich/corefx,stone-li/corefx,richlander/corefx,Ermiar/corefx,krk/corefx,nchikanov/corefx,elijah6/corefx,DnlHarvey/corefx,alexperovich/corefx,weltkante/corefx,krk/corefx,Jiayili1/corefx,dhoehna/corefx,ericstj/corefx,wtgodbe/corefx,fgreinacher/corefx,JosephTremoulet/corefx,twsouthwick/corefx,zhenlan/corefx,dotnet-bot/corefx,MaggieTsang/corefx,zhenlan/corefx,dhoehna/corefx,JosephTremoulet/corefx,MaggieTsang/corefx,ptoonen/corefx,Jiayili1/corefx,nchikanov/corefx,DnlHarvey/corefx,weltkante/corefx,YoupHulsebos/corefx,rubo/corefx,ViktorHofer/corefx,tijoytom/corefx,mmitche/corefx,alexperovich/corefx,shimingsg/corefx,rahku/corefx,twsouthwick/corefx,the-dwyer/corefx,gkhanna79/corefx,richlander/corefx,nchikanov/corefx,mmitche/corefx,mazong1123/corefx,mazong1123/corefx,rubo/corefx,seanshpark/corefx,krytarowski/corefx,twsouthwick/corefx,mmitche/corefx,nchikanov/corefx,gkhanna79/corefx,krytarowski/corefx,the-dwyer/corefx,ravimeda/corefx,shimingsg/corefx,stephenmichaelf/corefx,dhoehna/corefx,weltkante/corefx,rahku/corefx,billwert/corefx,gkhanna79/corefx,rjxby/corefx,shimingsg/corefx,weltkante/corefx,mazong1123/corefx,krytarowski/corefx,dotnet-bot/corefx,parjong/corefx,axelheer/corefx,gkhanna79/corefx,tijoytom/corefx,rjxby/corefx,YoupHulsebos/corefx,rjxby/corefx,parjong/corefx,mmitche/corefx,nbarbettini/corefx,JosephTremoulet/corefx,elijah6/corefx,mazong1123/corefx,mazong1123/corefx,parjong/corefx,ravimeda/corefx,cydhaselton/corefx,dotnet-bot/corefx,cydhaselton/corefx,nchikanov/corefx,wtgodbe/corefx,fgreinacher/corefx,MaggieTsang/corefx,alexperovich/corefx,zhenlan/corefx,twsouthwick/corefx,rahku/corefx,axelheer/corefx,the-dwyer/corefx,elijah6/corefx,ptoonen/corefx,ViktorHofer/corefx,stone-li/corefx,Jiayili1/corefx,Jiayili1/corefx,stone-li/corefx,nbarbettini/corefx,ViktorHofer/corefx,MaggieTsang/corefx,cydhaselton/corefx,YoupHulsebos/corefx,billwert/corefx,dhoehna/corefx,shimingsg/corefx,dotnet-bot/corefx,krytarowski/corefx,krk/corefx,elijah6/corefx,Petermarcu/corefx,billwert/corefx,dotnet-bot/corefx,weltkante/corefx,ptoonen/corefx,seanshpark/corefx,MaggieTsang/corefx,dotnet-bot/corefx,ericstj/corefx,wtgodbe/corefx,mmitche/corefx,stephenmichaelf/corefx,shimingsg/corefx,DnlHarvey/corefx,Ermiar/corefx,jlin177/corefx,Ermiar/corefx,JosephTremoulet/corefx,YoupHulsebos/corefx,the-dwyer/corefx,the-dwyer/corefx,parjong/corefx,billwert/corefx,jlin177/corefx,ericstj/corefx,stone-li/corefx,ravimeda/corefx,krk/corefx,Petermarcu/corefx,richlander/corefx,axelheer/corefx,JosephTremoulet/corefx,yizhang82/corefx,cydhaselton/corefx,stephenmichaelf/corefx,krytarowski/corefx,dotnet-bot/corefx,alexperovich/corefx,elijah6/corefx,shimingsg/corefx,Ermiar/corefx,Jiayili1/corefx,rahku/corefx,DnlHarvey/corefx,twsouthwick/corefx,ptoonen/corefx,jlin177/corefx,Jiayili1/corefx,dhoehna/corefx,MaggieTsang/corefx,cydhaselton/corefx,wtgodbe/corefx,DnlHarvey/corefx,mmitche/corefx,krk/corefx,Ermiar/corefx,rjxby/corefx,yizhang82/corefx,dhoehna/corefx,stephenmichaelf/corefx,zhenlan/corefx,jlin177/corefx,rubo/corefx,ericstj/corefx,ptoonen/corefx,gkhanna79/corefx,seanshpark/corefx,nchikanov/corefx,jlin177/corefx,twsouthwick/corefx,richlander/corefx,stephenmichaelf/corefx,weltkante/corefx,axelheer/corefx,wtgodbe/corefx,ViktorHofer/corefx,elijah6/corefx,rjxby/corefx,shimingsg/corefx,nchikanov/corefx,ViktorHofer/corefx,krk/corefx,zhenlan/corefx,tijoytom/corefx