[clang] [LifetimeSafety] Add support for iterator arithmetic (PR #195442)

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NeKon69 wrote:

I implemented something roughly close to what you asked for (haven’t polished it yet though). Also I can’t really do the tests now, but I’ll get to them tomorrow. When you have time, could you please review whether this approach looks good?


https://github.com/llvm/llvm-project/pull/195442