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Add a test case for PTR_TO_FLOW_KEYS alu. Testing if alu with variable offset on flow_keys is rejected. For the fixed offset success case, we already have C code coverage to verify (e.g. via bpf_flow.c). Signed-off-by: Hao Sun <sunhao.th@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Yonghong Song <yonghong.song@linux.dev> Link: https://lore.kernel.org/bpf/20240115082028.9992-2-sunhao.th@gmail.com