[llvm] [llvm] Improve llvm.objectsize computation by computing GEP, alloca and malloc parameters bound (PR #115522)

[Harald van Dijk via llvm-commits]

hvdijk wrote:

To avoid confusion: this includes the changes from #115504 unmodified, and only the additional commit on top of that should be reviewed here?

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