selftests/bpf: Make pyperf600 a success again

pyperf600 has been running into 8K BPF_COMPLEXITY_LIMIT_JMP_SEQ limitations
for a long while now, after some internal compiler changes.

Until BPF verifier is bestowed with scalar evolution logic, make that test
actually work by doing what would anyone should do in such situations: by
moving repeatable per-iteration work into independently verified global
functions.

`void *` argument is a problem for global funcs, but a static function wrapper
doing necessary casts and a bit of __arg_nonnull magic dust is all it takes.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Tested-by: Pu Lehui <pulehui@huawei.com> # riscv
Reviewed-by: Pu Lehui <pulehui@huawei.com>
Link: https://lore.kernel.org/bpf/20260813232943.581283-1-andrii@kernel.org

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