'shift by register' operations are supported by eBPF interpreter, but were
accidently left out of x64 JIT compiler. Fix it and add a testcase.
Reported-by: NBrendan Gregg <brendan.d.gregg@gmail.com>
Signed-off-by: NAlexei Starovoitov <ast@plumgrid.com>
Fixes: 62258278 ("net: filter: x86: internal BPF JIT")
Signed-off-by: NDavid S. Miller <davem@davemloft.net>