llvm-project

3a1298b9 - [libc++][NFC] Replace typedefs with using declarations (#156009)

[libc++][NFC] Replace typedefs with using declarations (#156009) We've done quite a bit of refactoring recently in `<__tree>`. This patch finishes up replacing typedefs with using declarations. As a side-effect, this also adds some `_LIBCPP_NODEBUG` annotations, since the clang-tidy check catches these now.