[clang] Fix to attribute plugins reaching an unreachable (PR #70877)

[Shafik Yaghmour via cfe-commits]

shafik wrote:

Can you please add a more detailed description of the problem and what the fix actually is. The description is what ends up in the git log and it is important that we have enough details there to understand the PR and what changes it makes.

I do not see a test, can this fix be tested?

https://github.com/llvm/llvm-project/pull/70877