Small cleanup to Char.IsWhiteSpaceLatin1
Small cleanup to Char.IsWhiteSpaceLatin1

For some reason this is resulting in measurably better throughput, in particular for non-whitespace chars, so much so that it's visible in microbenchmarks against string.IsNullOrWhiteSpace.

If nothing else, it's cleaner.

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