[clang-tools-extra] Enforce SL.con.3: Add check to replace operator[] with at() (PR #90043)

[Paul Heidekrüger via cfe-commits]

PBHDK wrote:

> Check if you can commit to sebwolf-de:avoid-bounds-error-check

Unfortunately, we can't. We do not have access to Sebastian's LLVM fork.
Since Sebastian is out of office right now - this is one of the reasons we're involved - would you be ok with us submitting a new PR with our changes where we reference the current PR?



https://github.com/llvm/llvm-project/pull/90043