[libcxx-commits] [libcxx] [libcxx] Provide locale conversions to tests through lit substitution (PR #105651)

[via libcxx-commits]

llvmbot wrote:

<!--IGNORE-->
Failed to cherry-pick: 88e15b781506949c56936b8642774125772fdeb2

https://github.com/llvm/llvm-project/actions/runs/14959182193

Please manually backport the fix and push it to your github fork.  Once this is done, please create a [pull request](https://github.com/llvm/llvm-project/compare)

https://github.com/llvm/llvm-project/pull/105651