[llvm] [Draft] Support save/restore point splitting in shrink-wrap (PR #119359)

[dong jianqiang via llvm-commits]

https://github.com/dongjianqiang2 commented:

In practice this causes shrink wrapping to degenerate toward the traditional “save all at entry / restore all at exit” approach, losing the benefit of minimizing prologue/epilogue scope.

https://github.com/llvm/llvm-project/pull/119359