[llvm] [LoopRotate] Remove canRotateDeoptimizingLatchExit and multi-rotate (PR #162482)

[Marek Sedláček via llvm-commits]

mark-sed wrote:

> Note that the first reference here is non-public, was that intentional?

No a mistake on my side, which I caught, but you were faster. Sorry for that

https://github.com/llvm/llvm-project/pull/162482