[clang-tools-extra] [clang-tidy] Add `bugprone-virtual-arithmetic` check (PR #91951)

[via cfe-commits]

Discookie wrote:

(Finding classes with virtual member fns is a good heuristic for finding polymorphic objects in general, as previously discussed in https://github.com/llvm/llvm-project/pull/82977#issuecomment-1968111034.)

https://github.com/llvm/llvm-project/pull/91951