[clang] [coroutines] Introduce [[clang::coro_disable_lifetimebound]] (PR #76818)

[Chuanqi Xu via cfe-commits]

https://github.com/ChuanqiXu9 approved this pull request.

I feel good with this. We can do other improvements in other patches.

https://github.com/llvm/llvm-project/pull/76818