[llvm] Add clang::lifetimebound annotation to llvm::function_ref (PR #115019)

[David Blaikie via llvm-commits]

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

Please commit this when you've a chance to watch the bots relatively carefully - seems fairly likely to cause some undiscovered fallout.

https://github.com/llvm/llvm-project/pull/115019