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This patch adds a test to trigger the DCE to remove the whole subprog to ensure the verifier does not depend on a stable subprog index. The DCE is done by testing a global const. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211106014020.651638-1-kafai@fb.com