[llvm] [llvm] Use LazyValueInfo to improve llvm.objectsize computation (PR #114673)

[Nikita Popov via llvm-commits]

https://github.com/nikic requested changes to this pull request.

We definitely cannot use LVI inside InstCombine for invalidation reasons. Using it in LowerConstantIntrinsics may be theoretically possible, but I really don't want to go there.

Can your motivating cases be covered by ValueTracking helpers, either computeConstantRange() or computeKnownBits()?

https://github.com/llvm/llvm-project/pull/114673