[libc-commits] [libc] [libc] Implement vasprintf and asprintf (PR #98824)

[Michael Jones via libc-commits]

https://github.com/michaelrj-google approved this pull request.

Overall LGTM, but in the tests you need to make sure to free the buffer you get from `asprintf` every time, not just the last time.

https://github.com/llvm/llvm-project/pull/98824