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

[Younan Zhang via cfe-commits]

zyn0217 wrote:

Thank you @AaronBallman again for providing performance data from trackers. (I think it's also time for me to learn how to use the tracker, by the way :-)

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