[llvm] [llvm] Use computeConstantRange to improve llvm.objectsize computation (PR #115522)

[via llvm-commits]

serge-sans-paille wrote:

@jplehr and/or @ DavidSpickett could you give a try to this patchset to make sure it actually fixes #114673 ?

https://github.com/llvm/llvm-project/pull/115522