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

[Utkarsh Saxena via llvm-commits]

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usx95 wrote:

The contents are moved from `clang/test/Sema/warn-lifetime-analysis-nocfg.cpp`. AFAIK, I don't think git supports branching from a file.

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