perf stat: Show average value on multiple runs

When -r option is used, perf stat runs the command multiple times and
update stats in the evsel->stats.res_stats for global aggregation.  But
the value is never used and the value it prints at the end is just the
value from the last run.  I think we should print the average number of
multiple runs.

Add evlist__copy_res_stats() to update the aggr counter (for display)
using the values in the evsel->stats.res_stats.

Signed-off-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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