[libcxx-commits] [libcxx] [libc++] Optimize ranges::for_each for iterating over __trees (PR #164405)

[Louis Dionne via libcxx-commits]

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ldionne wrote:

If we are splitting the implementation from the main `for_each.h` header, we should also start splitting up the tests. We should do something like `for_each.associative.pass.cpp`.

https://github.com/llvm/llvm-project/pull/164405