Generate xorps instead of xorpd (#14385)
Generate xorps instead of xorpd (#14385)

xorps is one byte shorter when AVX is not used. Also saves a call to genGetInsForOper.
yizhang82/coreclr,mmitche/coreclr,krk/coreclr,wtgodbe/coreclr,rartemev/coreclr,mmitche/coreclr,krk/coreclr,parjong/coreclr,poizan42/coreclr,wateret/coreclr,yizhang82/coreclr,wateret/coreclr,ruben-ayrapetyan/coreclr,parjong/coreclr,poizan42/coreclr,wtgodbe/coreclr,ruben-ayrapetyan/coreclr,mmitche/coreclr,yizhang82/coreclr,cshung/coreclr,yizhang82/coreclr,JosephTremoulet/coreclr,parjong/coreclr,wateret/coreclr,poizan42/coreclr,cshung/coreclr,poizan42/coreclr,wtgodbe/coreclr,rartemev/coreclr,wateret/coreclr,parjong/coreclr,wateret/coreclr,rartemev/coreclr,ruben-ayrapetyan/coreclr,mmitche/coreclr,rartemev/coreclr,poizan42/coreclr,cshung/coreclr,mmitche/coreclr,yizhang82/coreclr,rartemev/coreclr,mmitche/coreclr,wtgodbe/coreclr,cshung/coreclr,krk/coreclr,wtgodbe/coreclr,JosephTremoulet/coreclr,krk/coreclr,ruben-ayrapetyan/coreclr,JosephTremoulet/coreclr,cshung/coreclr,krk/coreclr,krk/coreclr,wtgodbe/coreclr,rartemev/coreclr,ruben-ayrapetyan/coreclr,poizan42/coreclr,JosephTremoulet/coreclr,cshung/coreclr,yizhang82/coreclr,parjong/coreclr,ruben-ayrapetyan/coreclr,JosephTremoulet/coreclr,parjong/coreclr,JosephTremoulet/coreclr,wateret/coreclr