perf hists browser: Save pstack in the hist_browser

The struct pstack is to save currently applied thread and/or dso filters
in the browser.  So it'd be better to keep in the struct hist_browser.
This is a preparation to later change.

Suggested-by: Arnaldo Carvalho de Melo <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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