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When we have pointer type that is known to be non-null we only follow the non-null branch. This adds tests to cover the map_value pointer returned from a map lookup. To force an error if both branches are followed we do an ALU op on R10. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/159009168650.6313.7434084136067263554.stgit@john-Precision-5820-Tower