This commit adds additional test in the trace_event example, by
attaching the bpf program to MEM_UOPS_RETIRED.LOCK_LOADS event with
PERF_SAMPLE_ADDR requested, and print the lock address value read from
the bpf program to trace_pipe.
Signed-off-by: NTeng Qin <qinteng@fb.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>