[llvm] Revert "[RegAlloc] Relax the split constrain on MBB prolog" (PR #169990)

[Luo Yuanke via llvm-commits]

LuoYuanke wrote:

Pls feel free revert the patch if it breaks HIP. I try to look into the issue, but unfortunately I am not able to duplicate the issue locally. Can someone help to dump the assembly with the patch (https://github.com/llvm/llvm-project/pull/168259)  and without the patch (https://github.com/llvm/llvm-project/pull/168259)?

https://github.com/llvm/llvm-project/pull/169990