Improve performance for Math.Abs (#15823)
Improve performance for Math.Abs (#15823)

* Improve perf for Math.Abs

* Inline Math.Abs

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