fix lvaStressLclFldCB (#14676)
fix lvaStressLclFldCB (#14676)

Don't create trees with the same ID.
JosephTremoulet/coreclr,ruben-ayrapetyan/coreclr,wtgodbe/coreclr,poizan42/coreclr,cshung/coreclr,wateret/coreclr,mmitche/coreclr,ruben-ayrapetyan/coreclr,wateret/coreclr,yizhang82/coreclr,yizhang82/coreclr,krk/coreclr,poizan42/coreclr,mmitche/coreclr,wtgodbe/coreclr,mmitche/coreclr,wtgodbe/coreclr,ruben-ayrapetyan/coreclr,cshung/coreclr,mmitche/coreclr,cshung/coreclr,JosephTremoulet/coreclr,JosephTremoulet/coreclr,wateret/coreclr,wtgodbe/coreclr,krk/coreclr,wateret/coreclr,poizan42/coreclr,krk/coreclr,poizan42/coreclr,wtgodbe/coreclr,JosephTremoulet/coreclr,ruben-ayrapetyan/coreclr,yizhang82/coreclr,yizhang82/coreclr,cshung/coreclr,ruben-ayrapetyan/coreclr,yizhang82/coreclr,wateret/coreclr,cshung/coreclr,mmitche/coreclr,krk/coreclr,krk/coreclr,ruben-ayrapetyan/coreclr,poizan42/coreclr,mmitche/coreclr,JosephTremoulet/coreclr,poizan42/coreclr,wateret/coreclr,cshung/coreclr,wtgodbe/coreclr,krk/coreclr,yizhang82/coreclr,JosephTremoulet/coreclr