perf hists: Use own hpp_list for hierarchy mode

Now each hists has its own hpp lists in hierarchy.  So instead of having
a pointer to a single perf_hpp_fmt in a hist entry, make it point the
hpp_list for its level.  This will be used to support multiple sort keys
in a single hierarchy level.

Signed-off-by: Namhyung Kim <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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