[llvm] [IR] Reject a scalable byval argument in the verifier (PR #226170)

[Timur Baidusenov via llvm-commits]

bai-tim wrote:

Could you please review @paulwalker-arm @efriedma-quic?
cc @jakos-sec @vitalybuka, who reviewed the SafeStack version in #225067.

https://github.com/llvm/llvm-project/pull/226170