[PATCH] D99444: [ADT] Introduce lazy unique iterator

[David Blaikie via Phabricator via llvm-commits]

dblaikie added a comment.

I probably wouldn't mind an algorithm-like function, rather than an iterator (not composable, but avoids some of the harder design issues) - `llvm::for_each_unique_element(R, [](const T& t) { ... });`


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https://reviews.llvm.org/D99444