Merge branch 'bpf-jmp-seq-limit'

Alexei Starovoitov says:

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Patch 1 - jmp sequence limit
Patch 2 - improve existing tests
Patch 3 - add pyperf-based realistic bpf program that takes
          advantage of higher limit and use it as a stress test

v1->v2: fixed nit in patch 3. added Andrii's acks
====================

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>