[llvm] [RFC][BPF] Support Jump Table (PR #133856)

[Anton Protopopov via llvm-commits]

aspsk wrote:

Update. I have a patch for kernel + libbpf which uses this LLVM and which passes all my new selftests + all (but one) standard bpf selftests which are compiled to use `gotox` (`exceptions`, `cgroup_tcp_skb`, `cls_redirect`, `bpf_tcp_ca`, `bpf_iter_setsockopt`, `tc_change_tail`, `net_timestamping`, `tcpbpf_user`, `user_ringbuf`, `tcp_custom_syncookie`, `tcp_hdr_options`).

So far only one selftest fails (`tunnel`). Once I fix it (and cleanup `libbpf` part of the series a bit), I will prepare and send RFC.

https://github.com/llvm/llvm-project/pull/133856