[llvm] [LoopPeel] Implement initial peeling off the last loop iteration. (PR #139551)

[Alexander Kornienko via llvm-commits]

alexfh wrote:

The issues I saw are not present in a later revision (65c127f4c6b0da0e9bf1d49fc79fce9074e95264). I don't see any commits mentioning LoopPeel afterwards, so this seems to have been addressed.

https://github.com/llvm/llvm-project/pull/139551