[libcxx-commits] [libcxx] [libc++] Implement C++29 Bit Permutations P3104R6 (PR #217820)

[Jan Schultke via libcxx-commits]

https://github.com/eisenwave commented:

`bit_repeat` implementation could be better, and the PR needs tests.

https://github.com/llvm/llvm-project/pull/217820