[TensorExpr] Add shorthand versions for `splitWith{Mask,Tail}` functions. (#45946)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45946
Also, make these functions static - they are not using anything from
`LoopNest` and can be applied to any `Stmt`.
Test Plan: Imported from OSS
Reviewed By: bertmaher
Differential Revision: D24156002
Pulled By: ZolotukhinM
fbshipit-source-id: 1c7d205f85a2a1684e07eb836af662f10d0a50fc
Author
Mikhail Zolotukhin
