Cleanup GC tests
Cleanup GC tests

- Add mising tests (espcially for invalid arguments)

Contributes to #6286

billwert/corefx,alexperovich/corefx,kkurni/corefx,benjamin-bader/corefx,richlander/corefx,Petermarcu/corefx,ellismg/corefx,zhenlan/corefx,rahku/corefx,twsouthwick/corefx,Ermiar/corefx,cydhaselton/corefx,dotnet-bot/corefx,tstringer/corefx,richlander/corefx,alphonsekurian/corefx,Petermarcu/corefx,cartermp/corefx,cydhaselton/corefx,manu-silicon/corefx,axelheer/corefx,nbarbettini/corefx,twsouthwick/corefx,Priya91/corefx-1,marksmeltzer/corefx,weltkante/corefx,Jiayili1/corefx,kkurni/corefx,cartermp/corefx,parjong/corefx,the-dwyer/corefx,ericstj/corefx,tstringer/corefx,axelheer/corefx,ptoonen/corefx,richlander/corefx,ptoonen/corefx,billwert/corefx,ellismg/corefx,fgreinacher/corefx,jhendrixMSFT/corefx,marksmeltzer/corefx,the-dwyer/corefx,rahku/corefx,richlander/corefx,ravimeda/corefx,tstringer/corefx,mmitche/corefx,Petermarcu/corefx,ericstj/corefx,tstringer/corefx,YoupHulsebos/corefx,lggomez/corefx,manu-silicon/corefx,dotnet-bot/corefx,dsplaisted/corefx,dhoehna/corefx,twsouthwick/corefx,ptoonen/corefx,rjxby/corefx,seanshpark/corefx,stephenmichaelf/corefx,Ermiar/corefx,pallavit/corefx,wtgodbe/corefx,parjong/corefx,yizhang82/corefx,wtgodbe/corefx,benjamin-bader/corefx,kkurni/corefx,tijoytom/corefx,ViktorHofer/corefx,lggomez/corefx,DnlHarvey/corefx,rahku/corefx,benjamin-bader/corefx,jlin177/corefx,mmitche/corefx,dhoehna/corefx,shimingsg/corefx,cartermp/corefx,dotnet-bot/corefx,Petermarcu/corefx,ptoonen/corefx,tijoytom/corefx,YoupHulsebos/corefx,twsouthwick/corefx,wtgodbe/corefx,adamralph/corefx,Petermarcu/corefx,alexperovich/corefx,khdang/corefx,rahku/corefx,rahku/corefx,ravimeda/corefx,seanshpark/corefx,stone-li/corefx,rjxby/corefx,ellismg/corefx,ViktorHofer/corefx,krk/corefx,gkhanna79/corefx,seanshpark/corefx,zhenlan/corefx,mmitche/corefx,lggomez/corefx,pallavit/corefx,DnlHarvey/corefx,weltkante/corefx,cartermp/corefx,shmao/corefx,ravimeda/corefx,YoupHulsebos/corefx,Petermarcu/corefx,DnlHarvey/corefx,stone-li/corefx,YoupHulsebos/corefx,gkhanna79/corefx,shmao/corefx,ravimeda/corefx,iamjasonp/corefx,adamralph/corefx,nchikanov/corefx,dhoehna/corefx,wtgodbe/corefx,ViktorHofer/corefx,lggomez/corefx,weltkante/corefx,nchikanov/corefx,Priya91/corefx-1,richlander/corefx,seanshpark/corefx,alphonsekurian/corefx,kkurni/corefx,yizhang82/corefx,rjxby/corefx,shmao/corefx,ptoonen/corefx,shimingsg/corefx,jhendrixMSFT/corefx,stone-li/corefx,Chrisboh/corefx,krytarowski/corefx,rubo/corefx,cydhaselton/corefx,MaggieTsang/corefx,seanshpark/corefx,ravimeda/corefx,ravimeda/corefx,krytarowski/corefx,iamjasonp/corefx,nbarbettini/corefx,stephenmichaelf/corefx,BrennanConroy/corefx,khdang/corefx,YoupHulsebos/corefx,shahid-pk/corefx,nbarbettini/corefx,krytarowski/corefx,iamjasonp/corefx,mazong1123/corefx,krk/corefx,jlin177/corefx,ericstj/corefx,alphonsekurian/corefx,SGuyGe/corefx,ViktorHofer/corefx,Ermiar/corefx,DnlHarvey/corefx,fgreinacher/corefx,alphonsekurian/corefx,MaggieTsang/corefx,tijoytom/corefx,cydhaselton/corefx,tijoytom/corefx,benjamin-bader/corefx,alexperovich/corefx,shimingsg/corefx,ellismg/corefx,elijah6/corefx,MaggieTsang/corefx,krk/corefx,stephenmichaelf/corefx,billwert/corefx,mmitche/corefx,twsouthwick/corefx,Jiayili1/corefx,wtgodbe/corefx,DnlHarvey/corefx,MaggieTsang/corefx,Petermarcu/corefx,manu-silicon/corefx,shimingsg/corefx,Chrisboh/corefx,mmitche/corefx,mmitche/corefx,krk/corefx,nchikanov/corefx,weltkante/corefx,elijah6/corefx,pallavit/corefx,shmao/corefx,axelheer/corefx,gkhanna79/corefx,rahku/corefx,zhenlan/corefx,Priya91/corefx-1,yizhang82/corefx,zhenlan/corefx,MaggieTsang/corefx,mazong1123/corefx,BrennanConroy/corefx,iamjasonp/corefx,axelheer/corefx,JosephTremoulet/corefx,axelheer/corefx,kkurni/corefx,rubo/corefx,ericstj/corefx,manu-silicon/corefx,krytarowski/corefx,pallavit/corefx,Chrisboh/corefx,shahid-pk/corefx,Ermiar/corefx,dhoehna/corefx,shmao/corefx,billwert/corefx,JosephTremoulet/corefx,krytarowski/corefx,benjamin-bader/corefx,elijah6/corefx,jhendrixMSFT/corefx,adamralph/corefx,ellismg/corefx,elijah6/corefx,marksmeltzer/corefx,dotnet-bot/corefx,cartermp/corefx,marksmeltzer/corefx,YoupHulsebos/corefx,tstringer/corefx,Jiayili1/corefx,mazong1123/corefx,Jiayili1/corefx,JosephTremoulet/corefx,JosephTremoulet/corefx,tijoytom/corefx,yizhang82/corefx,krk/corefx,dhoehna/corefx,JosephTremoulet/corefx,gkhanna79/corefx,the-dwyer/corefx,ellismg/corefx,twsouthwick/corefx,ViktorHofer/corefx,stephenmichaelf/corefx,shahid-pk/corefx,khdang/corefx,shmao/corefx,cydhaselton/corefx,krk/corefx,gkhanna79/corefx,tijoytom/corefx,dotnet-bot/corefx,weltkante/corefx,the-dwyer/corefx,YoupHulsebos/corefx,SGuyGe/corefx,khdang/corefx,richlander/corefx,dotnet-bot/corefx,BrennanConroy/corefx,rjxby/corefx,krk/corefx,fgreinacher/corefx,elijah6/corefx,shimingsg/corefx,krytarowski/corefx,rjxby/corefx,shimingsg/corefx,dsplaisted/corefx,tijoytom/corefx,mazong1123/corefx,the-dwyer/corefx,jcme/corefx,shmao/corefx,yizhang82/corefx,jlin177/corefx,Jiayili1/corefx,manu-silicon/corefx,lggomez/corefx,dsplaisted/corefx,stone-li/corefx,gkhanna79/corefx,alphonsekurian/corefx,ptoonen/corefx,parjong/corefx,cydhaselton/corefx,billwert/corefx,benjamin-bader/corefx,jcme/corefx,jhendrixMSFT/corefx,dotnet-bot/corefx,ericstj/corefx,parjong/corefx,jlin177/corefx,Ermiar/corefx,pallavit/corefx,marksmeltzer/corefx,ViktorHofer/corefx,jcme/corefx,tstringer/corefx,ptoonen/corefx,manu-silicon/corefx,Priya91/corefx-1,stone-li/corefx,alphonsekurian/corefx,wtgodbe/corefx,Ermiar/corefx,nchikanov/corefx,nchikanov/corefx,rubo/corefx,rjxby/corefx,the-dwyer/corefx,yizhang82/corefx,weltkante/corefx,ravimeda/corefx,shahid-pk/corefx,alphonsekurian/corefx,nbarbettini/corefx,mmitche/corefx,Jiayili1/corefx,nchikanov/corefx,mazong1123/corefx,khdang/corefx,jcme/corefx,weltkante/corefx,jhendrixMSFT/corefx,jcme/corefx,SGuyGe/corefx,wtgodbe/corefx,dhoehna/corefx,lggomez/corefx,rahku/corefx,alexperovich/corefx,jlin177/corefx,parjong/corefx,richlander/corefx,MaggieTsang/corefx,stephenmichaelf/corefx,elijah6/corefx,stephenmichaelf/corefx,nbarbettini/corefx,nbarbettini/corefx,Chrisboh/corefx,marksmeltzer/corefx,zhenlan/corefx,Chrisboh/corefx,marksmeltzer/corefx,yizhang82/corefx,SGuyGe/corefx,elijah6/corefx,ericstj/corefx,stone-li/corefx,jhendrixMSFT/corefx,shahid-pk/corefx,krytarowski/corefx,axelheer/corefx,seanshpark/corefx,cydhaselton/corefx,Chrisboh/corefx,MaggieTsang/corefx,alexperovich/corefx,jcme/corefx,gkhanna79/corefx,rubo/corefx,cartermp/corefx,seanshpark/corefx,alexperovich/corefx,zhenlan/corefx,Priya91/corefx-1,iamjasonp/corefx,stone-li/corefx,JosephTremoulet/corefx,twsouthwick/corefx,nchikanov/corefx,billwert/corefx,DnlHarvey/corefx,khdang/corefx,stephenmichaelf/corefx,the-dwyer/corefx,zhenlan/corefx,Priya91/corefx-1,nbarbettini/corefx,mazong1123/corefx,mazong1123/corefx,Jiayili1/corefx,ericstj/corefx,lggomez/corefx,ViktorHofer/corefx,fgreinacher/corefx,iamjasonp/corefx,alexperovich/corefx,kkurni/corefx,parjong/corefx,DnlHarvey/corefx,SGuyGe/corefx,billwert/corefx,manu-silicon/corefx,jlin177/corefx,dhoehna/corefx,JosephTremoulet/corefx,jlin177/corefx,parjong/corefx,Ermiar/corefx,SGuyGe/corefx,jhendrixMSFT/corefx,iamjasonp/corefx,rjxby/corefx,shahid-pk/corefx,pallavit/corefx,rubo/corefx,shimingsg/corefx