JIT: fix desktop build break
JIT: fix desktop build break

Desktop builds warn about unreachable code after returns, so modify
how finally chain merging is enabled and disabled in various configs.

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