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

[David Spickett via llvm-commits]

DavidSpickett wrote:

This has broken 2 stage builds on at least PowerPC and AArch64:
https://lab.llvm.org/buildbot/#/builders/76/builds/4298
https://lab.llvm.org/buildbot/#/builders/41/builds/3259

Making a reproducer for that will be tricky so I suggest reverting this for now. It's possible you can reproduce it by doing a 2 stage build on x86 as well, we just don't appear to have a bot doing that.

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