[llvm] [BPF] Avoid relocation for jumptable entries (PR #166301)

[via llvm-commits]

https://github.com/eddyz87 approved this pull request.

The change makes sense, thank you!
Tested with planned kernel [selftests](https://lore.kernel.org/bpf/20251102205722.3266908-1-a.s.protopopov@gmail.com/T/#m9e4bb26db48bf7df8e4e30dbd392ed999c36d858), no more relocations in the `.jumptables` section.

https://github.com/llvm/llvm-project/pull/166301