perf tools: Add debug prints

It is useful to see the arguments to perf_event_open and whether the
perf events ring buffer was mmapped per-cpu or per-thread.

That information will now be displayed when verbose is 2 i.e option -vv.

Signed-off-by: Adrian Hunter <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ fixup trivial conflict with fcb14f7 ]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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