perf hists: Support filtering in hierarchy mode

The hists__filter_hierarchy() function implements filtering in hierarchy
mode.  Now we have hist_entry__filter() so use it for entries in the
hierarchy.  It returns 3 kind of values.

A negative value means that it's not filtered by this type.  It marks
current entry as filtered tentatively so if a lower level entry removes
the filter it also removes the all parent so that we can find the entry
in the output.

Zero means it's filtered out by this type. A positive value means it's
not filtered so it removes the filter and shows in the output.  In these
cases, it moves to next entry since lower level entry won't match by
this type of filter anymore.  Thus all children will be filtered or not
together.

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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