Restore CustomLauncher to Test Population
Restore CustomLauncher to Test Population

Fixes https://github.com/dotnet/coreclr/issues/4076.
Custom launcher is needed for CoreRT tests.

YongseopKim/coreclr,jhendrixMSFT/coreclr,josteink/coreclr,bartonjs/coreclr,YongseopKim/coreclr,ramarag/coreclr,SlavaRa/coreclr,krytarowski/coreclr,James-Ko/coreclr,josteink/coreclr,sagood/coreclr,gkhanna79/coreclr,parjong/coreclr,ZhichengZhu/coreclr,ramarag/coreclr,botaberg/coreclr,pgavlin/coreclr,sjsinju/coreclr,sjsinju/coreclr,bartdesmet/coreclr,jhendrixMSFT/coreclr,jamesqo/coreclr,krytarowski/coreclr,neurospeech/coreclr,sagood/coreclr,roncain/coreclr,ragmani/coreclr,poizan42/coreclr,neurospeech/coreclr,yizhang82/coreclr,jamesqo/coreclr,ragmani/coreclr,botaberg/coreclr,Dmitry-Me/coreclr,KrzysztofCwalina/coreclr,naamunds/coreclr,kyulee1/coreclr,krk/coreclr,pgavlin/coreclr,KrzysztofCwalina/coreclr,gkhanna79/coreclr,wtgodbe/coreclr,andschwa/coreclr,yeaicc/coreclr,mskvortsov/coreclr,qiudesong/coreclr,dasMulli/coreclr,LLITCHEV/coreclr,dpodder/coreclr,sagood/coreclr,bartonjs/coreclr,alexperovich/coreclr,KrzysztofCwalina/coreclr,josteink/coreclr,poizan42/coreclr,dpodder/coreclr,cmckinsey/coreclr,wtgodbe/coreclr,alexperovich/coreclr,manu-silicon/coreclr,sejongoh/coreclr,KrzysztofCwalina/coreclr,sejongoh/coreclr,mskvortsov/coreclr,naamunds/coreclr,neurospeech/coreclr,krytarowski/coreclr,KrzysztofCwalina/coreclr,bartonjs/coreclr,sjsinju/coreclr,neurospeech/coreclr,ruben-ayrapetyan/coreclr,parjong/coreclr,hseok-oh/coreclr,krk/coreclr,shahid-pk/coreclr,poizan42/coreclr,cshung/coreclr,botaberg/coreclr,shahid-pk/coreclr,LLITCHEV/coreclr,tijoytom/coreclr,yizhang82/coreclr,sejongoh/coreclr,dasMulli/coreclr,wtgodbe/coreclr,dasMulli/coreclr,naamunds/coreclr,yeaicc/coreclr,kyulee1/coreclr,wtgodbe/coreclr,yeaicc/coreclr,James-Ko/coreclr,mmitche/coreclr,krytarowski/coreclr,LLITCHEV/coreclr,sjsinju/coreclr,yeaicc/coreclr,LLITCHEV/coreclr,ragmani/coreclr,parjong/coreclr,sagood/coreclr,parjong/coreclr,vinnyrom/coreclr,schellap/coreclr,mmitche/coreclr,bartdesmet/coreclr,krytarowski/coreclr,andschwa/coreclr,poizan42/coreclr,bartonjs/coreclr,russellhadley/coreclr,alexperovich/coreclr,ramarag/coreclr,Dmitry-Me/coreclr,krk/coreclr,martinwoodward/coreclr,neurospeech/coreclr,martinwoodward/coreclr,ZhichengZhu/coreclr,James-Ko/coreclr,cydhaselton/coreclr,cydhaselton/coreclr,andschwa/coreclr,jhendrixMSFT/coreclr,gkhanna79/coreclr,pgavlin/coreclr,wateret/coreclr,martinwoodward/coreclr,James-Ko/coreclr,James-Ko/coreclr,mskvortsov/coreclr,YongseopKim/coreclr,josteink/coreclr,qiudesong/coreclr,jhendrixMSFT/coreclr,rartemev/coreclr,dpodder/coreclr,dasMulli/coreclr,sjsinju/coreclr,ruben-ayrapetyan/coreclr,cmckinsey/coreclr,roncain/coreclr,cmckinsey/coreclr,alexperovich/coreclr,YongseopKim/coreclr,cshung/coreclr,naamunds/coreclr,ruben-ayrapetyan/coreclr,yizhang82/coreclr,tijoytom/coreclr,pgavlin/coreclr,cmckinsey/coreclr,SlavaRa/coreclr,naamunds/coreclr,James-Ko/coreclr,AlexGhiondea/coreclr,cydhaselton/coreclr,manu-silicon/coreclr,ZhichengZhu/coreclr,sejongoh/coreclr,Dmitry-Me/coreclr,shahid-pk/coreclr,dasMulli/coreclr,Dmitry-Me/coreclr,sagood/coreclr,bartdesmet/coreclr,JosephTremoulet/coreclr,naamunds/coreclr,wateret/coreclr,qiudesong/coreclr,wateret/coreclr,roncain/coreclr,botaberg/coreclr,mmitche/coreclr,shahid-pk/coreclr,sejongoh/coreclr,sagood/coreclr,dpodder/coreclr,roncain/coreclr,cshung/coreclr,vinnyrom/coreclr,hseok-oh/coreclr,JosephTremoulet/coreclr,ZhichengZhu/coreclr,pgavlin/coreclr,bartdesmet/coreclr,manu-silicon/coreclr,jamesqo/coreclr,wateret/coreclr,ramarag/coreclr,alexperovich/coreclr,kyulee1/coreclr,schellap/coreclr,AlexGhiondea/coreclr,manu-silicon/coreclr,wateret/coreclr,roncain/coreclr,martinwoodward/coreclr,andschwa/coreclr,bartdesmet/coreclr,ruben-ayrapetyan/coreclr,JonHanna/coreclr,sjsinju/coreclr,hseok-oh/coreclr,cydhaselton/coreclr,ruben-ayrapetyan/coreclr,SlavaRa/coreclr,krytarowski/coreclr,ramarag/coreclr,JonHanna/coreclr,yizhang82/coreclr,rartemev/coreclr,krk/coreclr,krk/coreclr,ramarag/coreclr,cmckinsey/coreclr,JonHanna/coreclr,rartemev/coreclr,JonHanna/coreclr,mmitche/coreclr,rartemev/coreclr,jhendrixMSFT/coreclr,JosephTremoulet/coreclr,tijoytom/coreclr,ZhichengZhu/coreclr,naamunds/coreclr,mskvortsov/coreclr,KrzysztofCwalina/coreclr,andschwa/coreclr,LLITCHEV/coreclr,russellhadley/coreclr,jamesqo/coreclr,russellhadley/coreclr,ragmani/coreclr,ZhichengZhu/coreclr,jamesqo/coreclr,wtgodbe/coreclr,mmitche/coreclr,russellhadley/coreclr,yeaicc/coreclr,cshung/coreclr,ramarag/coreclr,qiudesong/coreclr,shahid-pk/coreclr,AlexGhiondea/coreclr,cshung/coreclr,yeaicc/coreclr,andschwa/coreclr,SlavaRa/coreclr,martinwoodward/coreclr,Dmitry-Me/coreclr,JonHanna/coreclr,vinnyrom/coreclr,parjong/coreclr,tijoytom/coreclr,vinnyrom/coreclr,yizhang82/coreclr,jhendrixMSFT/coreclr,shahid-pk/coreclr,Dmitry-Me/coreclr,josteink/coreclr,sejongoh/coreclr,JosephTremoulet/coreclr,hseok-oh/coreclr,roncain/coreclr,schellap/coreclr,botaberg/coreclr,mskvortsov/coreclr,bartonjs/coreclr,bartonjs/coreclr,parjong/coreclr,mskvortsov/coreclr,dasMulli/coreclr,sejongoh/coreclr,roncain/coreclr,kyulee1/coreclr,poizan42/coreclr,russellhadley/coreclr,neurospeech/coreclr,bartdesmet/coreclr,Dmitry-Me/coreclr,JosephTremoulet/coreclr,hseok-oh/coreclr,josteink/coreclr,cmckinsey/coreclr,alexperovich/coreclr,schellap/coreclr,bartonjs/coreclr,cydhaselton/coreclr,SlavaRa/coreclr,dpodder/coreclr,krk/coreclr,vinnyrom/coreclr,cmckinsey/coreclr,ragmani/coreclr,ZhichengZhu/coreclr,gkhanna79/coreclr,dasMulli/coreclr,vinnyrom/coreclr,jhendrixMSFT/coreclr,qiudesong/coreclr,SlavaRa/coreclr,JonHanna/coreclr,ruben-ayrapetyan/coreclr,schellap/coreclr,gkhanna79/coreclr,martinwoodward/coreclr,botaberg/coreclr,schellap/coreclr,AlexGhiondea/coreclr,poizan42/coreclr,YongseopKim/coreclr,bartdesmet/coreclr,AlexGhiondea/coreclr,vinnyrom/coreclr,manu-silicon/coreclr,wtgodbe/coreclr,LLITCHEV/coreclr,manu-silicon/coreclr,gkhanna79/coreclr,kyulee1/coreclr,manu-silicon/coreclr,mmitche/coreclr,rartemev/coreclr,yizhang82/coreclr,josteink/coreclr,cydhaselton/coreclr,tijoytom/coreclr,cshung/coreclr,schellap/coreclr,qiudesong/coreclr,andschwa/coreclr,russellhadley/coreclr,tijoytom/coreclr,martinwoodward/coreclr,hseok-oh/coreclr,wateret/coreclr,dpodder/coreclr,jamesqo/coreclr,kyulee1/coreclr,yeaicc/coreclr,AlexGhiondea/coreclr,rartemev/coreclr,ragmani/coreclr,LLITCHEV/coreclr,pgavlin/coreclr,YongseopKim/coreclr,JosephTremoulet/coreclr,KrzysztofCwalina/coreclr,shahid-pk/coreclr