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The Topdown metrics events were added as 'perf stat' default events
since commit 42641d6f ("perf stat: Add Topdown metrics events as
default events").

However, the perf attr tests were not updated
accordingly.

The perf attr test fails on the platform which supports Topdown metrics.

  # perf test 17

    17: Setup struct perf_event_attr        :FAILED!

Add Topdown metrics events into perf attr test cases. Make them optional
since they are only available on newer platforms.

Fixes: 42641d6f

 ("perf stat: Add Topdown metrics events as default events")
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/1633031566-176517-1-git-send-email-kan.liang@linux.intel.com

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>