Skip removed loops in `optBlockIsLoopEntry`
Skip removed loops in `optBlockIsLoopEntry`

This allows running this utility downstream of loop unrolling.

yeaicc/coreclr,qiudesong/coreclr,krk/coreclr,parjong/coreclr,ragmani/coreclr,parjong/coreclr,botaberg/coreclr,Dmitry-Me/coreclr,kyulee1/coreclr,parjong/coreclr,wateret/coreclr,sjsinju/coreclr,dpodder/coreclr,James-Ko/coreclr,qiudesong/coreclr,dpodder/coreclr,cmckinsey/coreclr,cmckinsey/coreclr,JosephTremoulet/coreclr,AlexGhiondea/coreclr,mskvortsov/coreclr,wtgodbe/coreclr,rartemev/coreclr,cmckinsey/coreclr,qiudesong/coreclr,pgavlin/coreclr,pgavlin/coreclr,pgavlin/coreclr,neurospeech/coreclr,gkhanna79/coreclr,JonHanna/coreclr,yeaicc/coreclr,cmckinsey/coreclr,tijoytom/coreclr,qiudesong/coreclr,James-Ko/coreclr,AlexGhiondea/coreclr,jamesqo/coreclr,tijoytom/coreclr,cshung/coreclr,gkhanna79/coreclr,JonHanna/coreclr,sjsinju/coreclr,dpodder/coreclr,wateret/coreclr,yizhang82/coreclr,parjong/coreclr,mmitche/coreclr,parjong/coreclr,sjsinju/coreclr,yizhang82/coreclr,alexperovich/coreclr,jamesqo/coreclr,ruben-ayrapetyan/coreclr,yeaicc/coreclr,qiudesong/coreclr,cydhaselton/coreclr,rartemev/coreclr,kyulee1/coreclr,neurospeech/coreclr,pgavlin/coreclr,wtgodbe/coreclr,kyulee1/coreclr,mmitche/coreclr,alexperovich/coreclr,wateret/coreclr,krk/coreclr,neurospeech/coreclr,sagood/coreclr,wateret/coreclr,yizhang82/coreclr,tijoytom/coreclr,hseok-oh/coreclr,Dmitry-Me/coreclr,krytarowski/coreclr,yeaicc/coreclr,cydhaselton/coreclr,dpodder/coreclr,JosephTremoulet/coreclr,mskvortsov/coreclr,krytarowski/coreclr,poizan42/coreclr,russellhadley/coreclr,krk/coreclr,poizan42/coreclr,ragmani/coreclr,YongseopKim/coreclr,sagood/coreclr,neurospeech/coreclr,YongseopKim/coreclr,jamesqo/coreclr,russellhadley/coreclr,sagood/coreclr,JonHanna/coreclr,krk/coreclr,Dmitry-Me/coreclr,pgavlin/coreclr,rartemev/coreclr,tijoytom/coreclr,JonHanna/coreclr,rartemev/coreclr,JosephTremoulet/coreclr,neurospeech/coreclr,AlexGhiondea/coreclr,hseok-oh/coreclr,mskvortsov/coreclr,poizan42/coreclr,ruben-ayrapetyan/coreclr,ruben-ayrapetyan/coreclr,kyulee1/coreclr,neurospeech/coreclr,sagood/coreclr,cydhaselton/coreclr,ruben-ayrapetyan/coreclr,sagood/coreclr,russellhadley/coreclr,mskvortsov/coreclr,rartemev/coreclr,krytarowski/coreclr,dpodder/coreclr,russellhadley/coreclr,AlexGhiondea/coreclr,James-Ko/coreclr,krytarowski/coreclr,wtgodbe/coreclr,poizan42/coreclr,yeaicc/coreclr,AlexGhiondea/coreclr,mmitche/coreclr,YongseopKim/coreclr,ragmani/coreclr,krytarowski/coreclr,cshung/coreclr,alexperovich/coreclr,wateret/coreclr,krk/coreclr,kyulee1/coreclr,poizan42/coreclr,cmckinsey/coreclr,yeaicc/coreclr,ragmani/coreclr,Dmitry-Me/coreclr,botaberg/coreclr,cmckinsey/coreclr,yeaicc/coreclr,krk/coreclr,YongseopKim/coreclr,pgavlin/coreclr,cydhaselton/coreclr,mskvortsov/coreclr,botaberg/coreclr,hseok-oh/coreclr,kyulee1/coreclr,sjsinju/coreclr,hseok-oh/coreclr,mmitche/coreclr,sagood/coreclr,gkhanna79/coreclr,yizhang82/coreclr,JosephTremoulet/coreclr,parjong/coreclr,wtgodbe/coreclr,mmitche/coreclr,tijoytom/coreclr,cmckinsey/coreclr,JosephTremoulet/coreclr,jamesqo/coreclr,ruben-ayrapetyan/coreclr,wateret/coreclr,sjsinju/coreclr,jamesqo/coreclr,hseok-oh/coreclr,tijoytom/coreclr,cshung/coreclr,hseok-oh/coreclr,botaberg/coreclr,mmitche/coreclr,YongseopKim/coreclr,rartemev/coreclr,russellhadley/coreclr,dpodder/coreclr,cydhaselton/coreclr,krytarowski/coreclr,yizhang82/coreclr,wtgodbe/coreclr,mskvortsov/coreclr,James-Ko/coreclr,ragmani/coreclr,gkhanna79/coreclr,Dmitry-Me/coreclr,sjsinju/coreclr,ruben-ayrapetyan/coreclr,poizan42/coreclr,ragmani/coreclr,alexperovich/coreclr,alexperovich/coreclr,gkhanna79/coreclr,AlexGhiondea/coreclr,jamesqo/coreclr,botaberg/coreclr,cydhaselton/coreclr,cshung/coreclr,Dmitry-Me/coreclr,JonHanna/coreclr,cshung/coreclr,wtgodbe/coreclr,JonHanna/coreclr,cshung/coreclr,alexperovich/coreclr,JosephTremoulet/coreclr,gkhanna79/coreclr,James-Ko/coreclr,Dmitry-Me/coreclr,YongseopKim/coreclr,yizhang82/coreclr,James-Ko/coreclr,qiudesong/coreclr,russellhadley/coreclr,botaberg/coreclr