[DF] Add VecOps::StableArgsort and VecOps::StableSort
[DF] Add VecOps::StableArgsort and VecOps::StableSort

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root