[llvm] [LV][NFC] Emit remarks when failing to vectorise early exit loops (PR #225078)

[Luke Lau via llvm-commits]

https://github.com/lukel97 commented:

I don't really have any better ideas for that DebugLoc so I'm fine with it. Although it looks like the unit tests need updating

https://github.com/llvm/llvm-project/pull/225078