[clang] [clang] Introduce [[clang::lifetime_capture_by(X)]] (PR #111499)

[Nikita Popov via cfe-commits]

nikic wrote:

I've reverted this change, because it causes a large compile-time regression, see https://llvm-compile-time-tracker.com/compare.php?from=4a68e4cbd2423dcacada8162ab7c4bb8d7f7e2cf&to=8c4331c1abeb33eabf3cdbefa7f2b6e0540e7f4f&stat=instructions:u.

https://github.com/llvm/llvm-project/pull/111499