[llvm] [SCEV] Check bitwidth for constant ranges comparison (PR #150364)

[Nikita Popov via llvm-commits]

nikic wrote:

> I think this should at least be an assert?
> 
> I used the `isKnownPredicate` downstream without converting the SCEV to the wider type and faced the crash when going through this API.

Yes, this should be an assert. These APIs generally assume matching types.

https://github.com/llvm/llvm-project/pull/150364