[clang] [clang] Warn [[clang::lifetimebound]] misusages on types (PR #118281)

[Ilya Biryukov via cfe-commits]

https://github.com/ilya-biryukov commented:

Thanks for digging through that! This clearly looks like a good improvement and I wanted to mention that we had users genuinely confused about this before.

I only have a few suggestions, otherwise very supportive of the patch.

https://github.com/llvm/llvm-project/pull/118281