[llvm] [IR] Remove options to make scalable TypeSize access a warning (PR #156336)

[Sander de Smalen via llvm-commits]

https://github.com/sdesmalen-arm approved this pull request.

Given how scalable vector support has matured in LLVM over the past few years and that Clang has stopped demoting these errors for a while now, it makes sense for this code to be removed.

https://github.com/llvm/llvm-project/pull/156336