[llvm] [AArch64] Add flag to control unrolling for small multi-exit loops (PR #131998)

[Florian Hahn via llvm-commits]

https://github.com/fhahn commented:

I am not sure adding a very specialized option for this. Is there a reason we can't just do take the right decision per uarch to start with? It sounds like it is planned anyways?

https://github.com/llvm/llvm-project/pull/131998