[llvm] [LoopVectorize] Add support for vectorisation of more early exit loops (PR #88385)

[Graham Hunter via llvm-commits]

https://github.com/huntergr-arm commented:

Overall, I think I'd like to see the LoopVectorize changes split out, and if possible some analysis tests written.

Maybe if `loopMayFault` was in LAA (if rewritten to analyze accesses), or in LoopInfo, you could write some tests to show loops with and without faults.

https://github.com/llvm/llvm-project/pull/88385