Remove unnecessary ref parameters from String.cs
Remove unnecessary ref parameters from String.cs

For some reason, there seems to be some code in String.Split that takes ref parameters, even though they aren't actually assigned to.

This commit removes the `ref` annotations from the methods and their callers.
chuck-mitchell/coreclr,sagood/coreclr,sperling/coreclr,James-Ko/coreclr,krk/coreclr,mmitche/coreclr,cmckinsey/coreclr,JosephTremoulet/coreclr,rartemev/coreclr,krk/coreclr,yeaicc/coreclr,ZhichengZhu/coreclr,Lucrecious/coreclr,yizhang82/coreclr,dasMulli/coreclr,jhendrixMSFT/coreclr,pgavlin/coreclr,krk/coreclr,bartonjs/coreclr,mokchhya/coreclr,Lucrecious/coreclr,KrzysztofCwalina/coreclr,wkchoy74/coreclr,krytarowski/coreclr,swgillespie/coreclr,kyulee1/coreclr,sejongoh/coreclr,dpodder/coreclr,shahid-pk/coreclr,swgillespie/coreclr,JosephTremoulet/coreclr,sagood/coreclr,sagood/coreclr,bartonjs/coreclr,kyulee1/coreclr,russellhadley/coreclr,krytarowski/coreclr,mskvortsov/coreclr,schellap/coreclr,bartonjs/coreclr,russellhadley/coreclr,ruben-ayrapetyan/coreclr,LLITCHEV/coreclr,alexperovich/coreclr,shahid-pk/coreclr,sejongoh/coreclr,Lucrecious/coreclr,alexperovich/coreclr,sperling/coreclr,manu-silicon/coreclr,roncain/coreclr,sjsinju/coreclr,botaberg/coreclr,LLITCHEV/coreclr,cmckinsey/coreclr,gkhanna79/coreclr,ZhichengZhu/coreclr,roncain/coreclr,krk/coreclr,SlavaRa/coreclr,James-Ko/coreclr,qiudesong/coreclr,ragmani/coreclr,James-Ko/coreclr,gkhanna79/coreclr,botaberg/coreclr,cydhaselton/coreclr,swgillespie/coreclr,alexperovich/coreclr,vinnyrom/coreclr,Dmitry-Me/coreclr,Lucrecious/coreclr,sagood/coreclr,schellap/coreclr,ruben-ayrapetyan/coreclr,pgavlin/coreclr,russellhadley/coreclr,ramarag/coreclr,LLITCHEV/coreclr,Godin/coreclr,vinnyrom/coreclr,KrzysztofCwalina/coreclr,benpye/coreclr,AlexGhiondea/coreclr,yeaicc/coreclr,gkhanna79/coreclr,hseok-oh/coreclr,andschwa/coreclr,mmitche/coreclr,naamunds/coreclr,vinnyrom/coreclr,kyulee1/coreclr,parjong/coreclr,chuck-mitchell/coreclr,wateret/coreclr,James-Ko/coreclr,sejongoh/coreclr,yizhang82/coreclr,cmckinsey/coreclr,schellap/coreclr,shahid-pk/coreclr,benpye/coreclr,neurospeech/coreclr,gkhanna79/coreclr,JonHanna/coreclr,cshung/coreclr,benpye/coreclr,SlavaRa/coreclr,tijoytom/coreclr,Godin/coreclr,neurospeech/coreclr,neurospeech/coreclr,sperling/coreclr,swgillespie/coreclr,mskvortsov/coreclr,YongseopKim/coreclr,josteink/coreclr,manu-silicon/coreclr,jhendrixMSFT/coreclr,bartdesmet/coreclr,yeaicc/coreclr,yizhang82/coreclr,mmitche/coreclr,wkchoy74/coreclr,kyulee1/coreclr,mskvortsov/coreclr,andschwa/coreclr,martinwoodward/coreclr,schellap/coreclr,JonHanna/coreclr,yeaicc/coreclr,wtgodbe/coreclr,wkchoy74/coreclr,dasMulli/coreclr,bartdesmet/coreclr,ruben-ayrapetyan/coreclr,bartdesmet/coreclr,parjong/coreclr,mokchhya/coreclr,wkchoy74/coreclr,AlexGhiondea/coreclr,yizhang82/coreclr,krk/coreclr,alexperovich/coreclr,shahid-pk/coreclr,wateret/coreclr,alexperovich/coreclr,JosephTremoulet/coreclr,ragmani/coreclr,shahid-pk/coreclr,sjsinju/coreclr,pgavlin/coreclr,mskvortsov/coreclr,andschwa/coreclr,rartemev/coreclr,dasMulli/coreclr,mokchhya/coreclr,pgavlin/coreclr,manu-silicon/coreclr,LLITCHEV/coreclr,Lucrecious/coreclr,tijoytom/coreclr,martinwoodward/coreclr,sjsinju/coreclr,botaberg/coreclr,poizan42/coreclr,Lucrecious/coreclr,cshung/coreclr,ramarag/coreclr,josteink/coreclr,AlexGhiondea/coreclr,ZhichengZhu/coreclr,chuck-mitchell/coreclr,SlavaRa/coreclr,schellap/coreclr,tijoytom/coreclr,jhendrixMSFT/coreclr,schellap/coreclr,wkchoy74/coreclr,naamunds/coreclr,AlexGhiondea/coreclr,JonHanna/coreclr,schellap/coreclr,sperling/coreclr,sperling/coreclr,bartdesmet/coreclr,ruben-ayrapetyan/coreclr,KrzysztofCwalina/coreclr,cydhaselton/coreclr,krytarowski/coreclr,qiudesong/coreclr,Dmitry-Me/coreclr,andschwa/coreclr,cydhaselton/coreclr,benpye/coreclr,josteink/coreclr,pgavlin/coreclr,yeaicc/coreclr,KrzysztofCwalina/coreclr,ramarag/coreclr,sperling/coreclr,Lucrecious/coreclr,ragmani/coreclr,swgillespie/coreclr,mokchhya/coreclr,josteink/coreclr,bartdesmet/coreclr,LLITCHEV/coreclr,parjong/coreclr,cydhaselton/coreclr,mskvortsov/coreclr,josteink/coreclr,wateret/coreclr,krytarowski/coreclr,jamesqo/coreclr,rartemev/coreclr,Godin/coreclr,cshung/coreclr,rartemev/coreclr,hseok-oh/coreclr,bartonjs/coreclr,chuck-mitchell/coreclr,mokchhya/coreclr,cshung/coreclr,sejongoh/coreclr,JosephTremoulet/coreclr,botaberg/coreclr,yizhang82/coreclr,parjong/coreclr,AlexGhiondea/coreclr,KrzysztofCwalina/coreclr,dasMulli/coreclr,SlavaRa/coreclr,dpodder/coreclr,jamesqo/coreclr,dasMulli/coreclr,andschwa/coreclr,mmitche/coreclr,josteink/coreclr,martinwoodward/coreclr,krytarowski/coreclr,cmckinsey/coreclr,Godin/coreclr,russellhadley/coreclr,ramarag/coreclr,jhendrixMSFT/coreclr,rartemev/coreclr,Godin/coreclr,swgillespie/coreclr,ruben-ayrapetyan/coreclr,kyulee1/coreclr,jamesqo/coreclr,mskvortsov/coreclr,sjsinju/coreclr,ruben-ayrapetyan/coreclr,hseok-oh/coreclr,wtgodbe/coreclr,wateret/coreclr,vinnyrom/coreclr,neurospeech/coreclr,yeaicc/coreclr,russellhadley/coreclr,naamunds/coreclr,YongseopKim/coreclr,parjong/coreclr,gkhanna79/coreclr,benpye/coreclr,Dmitry-Me/coreclr,dpodder/coreclr,sagood/coreclr,sperling/coreclr,manu-silicon/coreclr,ramarag/coreclr,AlexGhiondea/coreclr,Dmitry-Me/coreclr,Dmitry-Me/coreclr,hseok-oh/coreclr,cmckinsey/coreclr,sjsinju/c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