[llvm-branch-commits] [libcxx] release/20.x: [libcxx] Provide locale conversions to tests through lit substitution (#105651) (PR #136449)

[Louis Dionne via llvm-branch-commits]

ldionne wrote:

@mstorsjo Is there a reason to want to backport this, since this is only fixing the test suite? I wouldn't oppose it, but it looks like this needs work to pass CI on the release branch and I'm not sure it's worth the trouble.

https://github.com/llvm/llvm-project/pull/136449