[llvm-branch-commits] [libcxx] release/23.x: [libc++] Opt `std::*set` out of map key extraction optimization (#220452) (PR #222641)

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llvmbot wrote:

@philnik777 @frederick-vs-ja What do you think about merging this PR to the release branch?

https://github.com/llvm/llvm-project/pull/222641