[clang] [clang] Implement lifetime analysis for lifetime_capture_by(X) (PR #115921)

[Utkarsh Saxena via cfe-commits]

================
@@ -3925,13 +3925,20 @@ def LifetimeCaptureByDocs : Documentation {
 parameter or implicit object parameter indicates that that objects that are referred to
----------------
usx95 wrote:

Done.

https://github.com/llvm/llvm-project/pull/115921