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

[Evgenii Stepanov via cfe-commits]

eugenis wrote:

Please note that this change also introduces new memory leaks on the waterfall:
https://lab.llvm.org/buildbot/#/builders/169/builds/5193

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