Undo unnecessary change from DateTime.Parse commit
Undo unnecessary change from DateTime.Parse commit

This change shouldn't have been included in my DateTime.Parse span change.  It was left-over from some local experimentation.  The change doesn't hurt anything functionally, but it does undo a small optimization; I've not measured whether it's impactful or not, so I'm putting it back the way it was.

cshung/coreclr,rartemev/coreclr,JosephTremoulet/coreclr,poizan42/coreclr,wateret/coreclr,rartemev/coreclr,yizhang82/coreclr,mmitche/coreclr,JosephTremoulet/coreclr,parjong/coreclr,mmitche/coreclr,krk/coreclr,wtgodbe/coreclr,ruben-ayrapetyan/coreclr,wateret/coreclr,yizhang82/coreclr,poizan42/coreclr,rartemev/coreclr,rartemev/coreclr,parjong/coreclr,wtgodbe/coreclr,wateret/coreclr,wateret/coreclr,yizhang82/coreclr,wateret/coreclr,parjong/coreclr,JosephTremoulet/coreclr,cshung/coreclr,ruben-ayrapetyan/coreclr,parjong/coreclr,yizhang82/coreclr,krk/coreclr,wtgodbe/coreclr,ruben-ayrapetyan/coreclr,mmitche/coreclr,poizan42/coreclr,rartemev/coreclr,parjong/coreclr,yizhang82/coreclr,JosephTremoulet/coreclr,poizan42/coreclr,mmitche/coreclr,mmitche/coreclr,mmitche/coreclr,krk/coreclr,wtgodbe/coreclr,cshung/coreclr,wtgodbe/coreclr,yizhang82/coreclr,parjong/coreclr,wateret/coreclr,rartemev/coreclr,ruben-ayrapetyan/coreclr,wtgodbe/coreclr,poizan42/coreclr,poizan42/coreclr,ruben-ayrapetyan/coreclr,JosephTremoulet/coreclr,cshung/coreclr,krk/coreclr,ruben-ayrapetyan/coreclr,cshung/coreclr,krk/coreclr,krk/coreclr,JosephTremoulet/coreclr,cshung/coreclr