[clang] [Clang][Parser] Don't always destroy template annotations at the end of a declaration (PR #89494)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Oops, I misunderstood what @cor3ntin was saying. One moment while I re-think now that I have understood his point better.

https://github.com/llvm/llvm-project/pull/89494