[llvm] [LoopFusion] Reform LCSSA after peelFusionCandidate's peelLoop (PR #200442)

[Ehsan Amiri via llvm-commits]

amehsan wrote:

> Anyways, I approve the patch. If the call can be removed, it is nice, in that case please remove and merge.

Just to make my comment clear, in case you have justification to keep the call, please explain it before merge. But I am not more convinced that the call should be removed.

https://github.com/llvm/llvm-project/pull/200442