perf trace: Add beautifier for futex 'operation' parm

That uses the arg mask mechanism just introduced to suppress ignored
arguments according to the futex operation.

Based on an initial patch from David Ahern that showed the need for some
way to allow args to tell how many further args should be shown.

Initial-patch-by: David Ahern <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lkml.kernel.org/n/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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