Add a test to check if the verifier correctly reason about the sign of an immediate spilled to stack by BPF_ST instruction. Signed-off-by: Hao Sun <sunhao.th@gmail.com> Link: https://lore.kernel.org/r/20231101-fix-check-stack-write-v3-2-f05c2b1473d5@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>