selftests: bpf: add trivial JSET tests
We seem to have no JSET instruction test, and LLVM does not generate it at all, so let's add a simple hand-coded test to make sure JIT implementations are correct. v2: - extend test_verifier to handle multiple inputs and add the sample there (Daniel) - add a sign extension case Signed-off-by: NJakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
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