[llvm] [LV] Remove assertions in IV overflow check (PR #115705)

[Luke Lau via llvm-commits]

lukel97 wrote:

> Could you check if this fixes #115755 and add `Fixes https://github.com/llvm/llvm-project/issues/115755` to the PR description?

It indeed fixes it, I've updated the PR description

https://github.com/llvm/llvm-project/pull/115705