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

[David Sherwood via llvm-commits]

david-arm wrote:

I just realised this patch is missing a test for a reverse loop, which also works perfectly fine and generates the correct code. I'll put up a new patch today.

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