Remove a field from the CopyToAsync async state machine (#7157)
Remove a field from the CopyToAsync async state machine (#7157)

The compiler is lifting the local ```bytesRead``` into a field on the async state machine, even though its value need not be preserved across any await.
tijoytom/coreclr,ruben-ayrapetyan/coreclr,sjsinju/coreclr,YongseopKim/coreclr,krytarowski/coreclr,yizhang82/coreclr,ragmani/coreclr,JonHanna/coreclr,tijoytom/coreclr,alexperovich/coreclr,Dmitry-Me/coreclr,russellhadley/coreclr,James-Ko/coreclr,sagood/coreclr,krytarowski/coreclr,yeaicc/coreclr,wtgodbe/coreclr,mmitche/coreclr,ruben-ayrapetyan/coreclr,jamesqo/coreclr,russellhadley/coreclr,dpodder/coreclr,pgavlin/coreclr,wtgodbe/coreclr,sjsinju/coreclr,poizan42/coreclr,gkhanna79/coreclr,yeaicc/coreclr,jamesqo/coreclr,krytarowski/coreclr,qiudesong/coreclr,dasMulli/coreclr,cydhaselton/coreclr,mskvortsov/coreclr,ragmani/coreclr,botaberg/coreclr,bartdesmet/coreclr,wateret/coreclr,Dmitry-Me/coreclr,qiudesong/coreclr,alexperovich/coreclr,bartdesmet/coreclr,YongseopKim/coreclr,neurospeech/coreclr,ramarag/coreclr,ragmani/coreclr,mskvortsov/coreclr,alexperovich/coreclr,cshung/coreclr,YongseopKim/coreclr,qiudesong/coreclr,James-Ko/coreclr,mskvortsov/coreclr,kyulee1/coreclr,hseok-oh/coreclr,neurospeech/coreclr,bartdesmet/coreclr,cydhaselton/coreclr,poizan42/coreclr,ramarag/coreclr,sjsinju/coreclr,cydhaselton/coreclr,cshung/coreclr,ruben-ayrapetyan/coreclr,sagood/coreclr,wtgodbe/coreclr,ramarag/coreclr,gkhanna79/coreclr,cydhaselton/coreclr,sjsinju/coreclr,poizan42/coreclr,yizhang82/coreclr,pgavlin/coreclr,rartemev/coreclr,qiudesong/coreclr,cshung/coreclr,cmckinsey/coreclr,cmckinsey/coreclr,dasMulli/coreclr,James-Ko/coreclr,mmitche/coreclr,rartemev/coreclr,James-Ko/coreclr,krk/coreclr,yeaicc/coreclr,parjong/coreclr,JonHanna/coreclr,dpodder/coreclr,jamesqo/coreclr,YongseopKim/coreclr,hseok-oh/coreclr,yizhang82/coreclr,gkhanna79/coreclr,tijoytom/coreclr,James-Ko/coreclr,AlexGhiondea/coreclr,wateret/coreclr,botaberg/coreclr,rartemev/coreclr,rartemev/coreclr,dasMulli/coreclr,YongseopKim/coreclr,botaberg/coreclr,ramarag/coreclr,yizhang82/coreclr,AlexGhiondea/coreclr,parjong/coreclr,JonHanna/coreclr,sagood/coreclr,JosephTremoulet/coreclr,dpodder/coreclr,ruben-ayrapetyan/coreclr,mmitche/coreclr,mmitche/coreclr,ragmani/coreclr,hseok-oh/coreclr,Dmitry-Me/coreclr,parjong/coreclr,cmckinsey/coreclr,neurospeech/coreclr,ramarag/coreclr,tijoytom/coreclr,sagood/coreclr,mskvortsov/coreclr,poizan42/coreclr,kyulee1/coreclr,tijoytom/coreclr,qiudesong/coreclr,JosephTremoulet/coreclr,yeaicc/coreclr,hseok-oh/coreclr,bartdesmet/coreclr,ragmani/coreclr,pgavlin/coreclr,jamesqo/coreclr,wtgodbe/coreclr,mmitche/coreclr,yeaicc/coreclr,dpodder/coreclr,Dmitry-Me/coreclr,cmckinsey/coreclr,AlexGhiondea/coreclr,botaberg/coreclr,rartemev/coreclr,poizan42/coreclr,dasMulli/coreclr,botaberg/coreclr,gkhanna79/coreclr,russellhadley/coreclr,krk/coreclr,wateret/coreclr,ramarag/coreclr,Dmitry-Me/coreclr,mskvortsov/coreclr,JosephTremoulet/coreclr,krk/coreclr,qiudesong/coreclr,JosephTremoulet/coreclr,tijoytom/coreclr,pgavlin/coreclr,dpodder/coreclr,neurospeech/coreclr,wateret/coreclr,krk/coreclr,ragmani/coreclr,sjsinju/coreclr,wtgodbe/coreclr,pgavlin/coreclr,cshung/coreclr,bartdesmet/coreclr,cydhaselton/coreclr,yeaicc/coreclr,James-Ko/coreclr,krk/coreclr,Dmitry-Me/coreclr,kyulee1/coreclr,krytarowski/coreclr,cmckinsey/coreclr,poizan42/coreclr,jamesqo/coreclr,JonHanna/coreclr,AlexGhiondea/coreclr,AlexGhiondea/coreclr,cmckinsey/coreclr,neurospeech/coreclr,sagood/coreclr,kyulee1/coreclr,russellhadley/coreclr,mmitche/coreclr,parjong/coreclr,mskvortsov/coreclr,gkhanna79/coreclr,hseok-oh/coreclr,alexperovich/coreclr,ramarag/coreclr,AlexGhiondea/coreclr,dasMulli/coreclr,russellhadley/coreclr,cydhaselton/coreclr,JonHanna/coreclr,kyulee1/coreclr,hseok-oh/coreclr,yizhang82/coreclr,wtgodbe/coreclr,parjong/coreclr,Dmitry-Me/coreclr,krytarowski/coreclr,russellhadley/coreclr,ruben-ayrapetyan/coreclr,alexperovich/coreclr,dasMulli/coreclr,cmckinsey/coreclr,yeaicc/coreclr,dasMulli/coreclr,kyulee1/coreclr,krk/coreclr,parjong/coreclr,gkhanna79/coreclr,wateret/coreclr,dpodder/coreclr,alexperovich/coreclr,rartemev/coreclr,jamesqo/coreclr,JosephTremoulet/coreclr,neurospeech/coreclr,cshung/coreclr,yizhang82/coreclr,JosephTremoulet/coreclr,cshung/coreclr,JonHanna/coreclr,sagood/coreclr,bartdesmet/coreclr,YongseopKim/coreclr,ruben-ayrapetyan/coreclr,bartdesmet/coreclr,sjsinju/coreclr,botaberg/coreclr,krytarowski/coreclr,wateret/coreclr,pgavlin/coreclr