[$] Cleaning up after BPF exceptions

Kumar Kartikeya Dwivedi has been working to add support for exceptions to BPFsince mid-2023. In July, Dwivedi postedthe first patch set in this effort, which adds support for basic stack unwinding.In February 2024, he postedthe second patch setaimed at letting the kernel release resources held by the BPF program when anexception occurs. This makes exceptions usable in many more contexts.