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

[Younan Zhang via cfe-commits]

zyn0217 wrote:

> > Oops. I thought there was some latency between clicking the merge button and your latest comment. Should I revert?
> 
> No worries, I should have hit `Request Changes` instead of `Comment`. :-) No need to revert yet.

OK, so if you feel that approach is better, I think I'd better to revert this commit, and I'm happy to re-apply it with that.

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