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Add simple test script to execute funciton graph tracer while BPF trampoline attaches and detaches from the functions being graph traced. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20191209000114.1876138-4-ast@kernel.org