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

[Martin Storsjö via libcxx-commits]

mstorsjo wrote:

Compared with the original PR, inconsistencies about backslash escaping in lit substitutions and such are now fixed, so that allowed getting rid of changes to lit itself from this PR.

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