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

[Douglas Yung via llvm-branch-commits]

dyung wrote:

The pre-merge testing is showing a test failure in `llvm-libc++-shared.cfg.in :: std/input.output/filesystems/fs.op.funcs/fs.op.space/space.pass.cpp`, can you confirm that this is not related to this change?

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