perf hists: Resort hist entries with hierarchy

For hierarchical output, each entry must be sorted in their rbtree
(hroot) properly.  Add hists__hierarchy_output_resort() to do the job.
Note that those hierarchy entries share the period counts, it'd be
important to update the hists->stats only once (for leaves).

Signed-off-by: Namhyung Kim <[email protected]>
Acked-by: Pekka Enberg <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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