Remove an IR walk during lowering.
Remove an IR walk during lowering.

Now that the `IsUnusedValue` flag is maintained by decomposition and
lowering, it does not need to be recalculated before LSRA.

YongseopKim/coreclr,botaberg/coreclr,ruben-ayrapetyan/coreclr,wtgodbe/coreclr,cshung/coreclr,AlexGhiondea/coreclr,yizhang82/coreclr,dpodder/coreclr,parjong/coreclr,pgavlin/coreclr,parjong/coreclr,rartemev/coreclr,yizhang82/coreclr,ragmani/coreclr,wateret/coreclr,cydhaselton/coreclr,hseok-oh/coreclr,parjong/coreclr,pgavlin/coreclr,kyulee1/coreclr,cydhaselton/coreclr,JonHanna/coreclr,JosephTremoulet/coreclr,parjong/coreclr,krk/coreclr,JonHanna/coreclr,JonHanna/coreclr,mmitche/coreclr,mskvortsov/coreclr,dpodder/coreclr,wtgodbe/coreclr,yizhang82/coreclr,ragmani/coreclr,mmitche/coreclr,russellhadley/coreclr,wtgodbe/coreclr,ragmani/coreclr,poizan42/coreclr,YongseopKim/coreclr,poizan42/coreclr,wtgodbe/coreclr,mskvortsov/coreclr,ragmani/coreclr,gkhanna79/coreclr,AlexGhiondea/coreclr,russellhadley/coreclr,YongseopKim/coreclr,hseok-oh/coreclr,rartemev/coreclr,poizan42/coreclr,botaberg/coreclr,pgavlin/coreclr,kyulee1/coreclr,dpodder/coreclr,JonHanna/coreclr,tijoytom/coreclr,tijoytom/coreclr,mmitche/coreclr,cydhaselton/coreclr,JosephTremoulet/coreclr,hseok-oh/coreclr,JosephTremoulet/coreclr,wateret/coreclr,russellhadley/coreclr,AlexGhiondea/coreclr,pgavlin/coreclr,yizhang82/coreclr,rartemev/coreclr,gkhanna79/coreclr,ruben-ayrapetyan/coreclr,rartemev/coreclr,cshung/coreclr,krk/coreclr,AlexGhiondea/coreclr,ruben-ayrapetyan/coreclr,wtgodbe/coreclr,JosephTremoulet/coreclr,hseok-oh/coreclr,kyulee1/coreclr,rartemev/coreclr,rartemev/coreclr,AlexGhiondea/coreclr,poizan42/coreclr,gkhanna79/coreclr,tijoytom/coreclr,cshung/coreclr,krk/coreclr,cydhaselton/coreclr,wateret/coreclr,ragmani/coreclr,tijoytom/coreclr,YongseopKim/coreclr,JosephTremoulet/coreclr,botaberg/coreclr,YongseopKim/coreclr,wateret/coreclr,ruben-ayrapetyan/coreclr,botaberg/coreclr,botaberg/coreclr,mmitche/coreclr,JonHanna/coreclr,YongseopKim/coreclr,gkhanna79/coreclr,mmitche/coreclr,gkhanna79/coreclr,mskvortsov/coreclr,wateret/coreclr,hseok-oh/coreclr,botaberg/coreclr,kyulee1/coreclr,russellhadley/coreclr,ruben-ayrapetyan/coreclr,wateret/coreclr,cydhaselton/coreclr,ruben-ayrapetyan/coreclr,yizhang82/coreclr,krk/coreclr,mskvortsov/coreclr,russellhadley/coreclr,kyulee1/coreclr,cshung/coreclr,dpodder/coreclr,mskvortsov/coreclr,ragmani/coreclr,yizhang82/coreclr,wtgodbe/coreclr,parjong/coreclr,mmitche/coreclr,tijoytom/coreclr,tijoytom/coreclr,pgavlin/coreclr,poizan42/coreclr,cshung/coreclr,pgavlin/coreclr,cydhaselton/coreclr,parjong/coreclr,krk/coreclr,gkhanna79/coreclr,dpodder/coreclr,krk/coreclr,russellhadley/coreclr,kyulee1/coreclr,AlexGhiondea/coreclr,hseok-oh/coreclr,JosephTremoulet/coreclr,dpodder/coreclr,JonHanna/coreclr,mskvortsov/coreclr,cshung/coreclr,poizan42/coreclr