[llvm-branch-commits] [libcxx] [lldb] release/21.x: [libc++] Ensure that we restore invariants in basic_filebuf::overflow (#147389) (PR #155712)

[Nikolas Klauser via llvm-branch-commits]

https://github.com/philnik777 approved this pull request.

The libc++ parts LGTM. I don't know enough about lldb to feel comfortable approving back-ports there.

https://github.com/llvm/llvm-project/pull/155712