[libcxx-commits] [libcxx] Mark some std::string functions noinline. (PR #72869)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne approved this pull request.

This makes sense to me. I hate introducing `_LIBCPP_NOINLINE`, but in this case the intent of these functions is pretty clear and allowing them to be inlined was an unintended side effect of adding `constexpr`.

https://github.com/llvm/llvm-project/pull/72869