This change tried to integrate a new count based aggregated type of perf script. The only difference of the format is that an aggregated count is added at the head of the original sample which means the same samples are repeated to the given count times. This is used to reduce the perf script size.
2 4005dc 400634 400684 7f68c5788793 0x4005c8/0x4005dc/P/-/-/0 ....
Implemented by a dedicated PerfReader AggregatedHybridPerfReader.