tools/libpf: Add offsetof/container_of macro in bpf_helpers.h
These two helpers will be used later in bpf_iter bpf program bpf_iter_netlink.c. Put them in bpf_helpers.h since they could be useful in other cases. Signed-off-by: NYonghong Song <yhs@fb.com> Signed-off-by: NAlexei Starovoitov <ast@kernel.org> Acked-by: NAndrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200509175919.2477104-1-yhs@fb.com
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