perf test: Workload test of metric and metricgroups

Test every metric and metricgroup with 'true' as a workload. For
metrics, check that we see the metric printed or get unsupported. If the
'true' workload executes too quickly retry with 'perf bench internals
synthesize'.

v3. Fix test condition (thanks to Paul A. Clarke <[email protected]>). Add a
    fallback case of a larger workload so that we don't ignore "<not
    counted>".
v2. Switched the workload to something faster.

Signed-off-by: Ian Rogers <[email protected]>
Reviewed-by: John Garry <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Jin Yao <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Clarke <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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