Use the alt JIT for S.P.CoreLib if altjitcrossgen is specified.
Use the alt JIT for S.P.CoreLib if altjitcrossgen is specified.

The check for altjitcrossgen was previously located s.t. only mscorlib
was being crossgen'd using the alt JIT (which is not very insteresting,
as mscorlib is just a facade these days). This change moves the check
back s.t. the alt JIT is also used for System.Private.CoreLib.

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