[clang] [LifetimeSafety] Avoid suggesting lifetimebound attribute on primary templates declarations (PR #203866)

[Gábor Horváth via cfe-commits]

https://github.com/Xazax-hun approved this pull request.

Once the FIXME is added and the conflict resolved this looks good to me, thanks!

https://github.com/llvm/llvm-project/pull/203866