[libcxx-commits] [libcxx] [libcxx] Optimize `ranges::fold_left_with_iter` for segmented iterators (PR #177853)

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c8ef wrote:

Hi reviewers, when you get a chance, could you please take a look at this patch? I think similar logic could also help with #121558.

https://github.com/llvm/llvm-project/pull/177853