[llvm] [IVDesc] Check loop-preheader for loop-legality when pass-remarks enabled (PR #166310)

[Florian Hahn via llvm-commits]

fhahn wrote:

> @fhahn Thank you for your continued interest following the review! May I proceed with this shortly?

Sure please go ahead and merge

https://github.com/llvm/llvm-project/pull/166310