perf dso: Sort symbols under lock

Determine if symbols are sorted, set the sorted flag and sort under
the dso lock. Done in the interest of thread safety.

Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Carsten Haitzler <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Jason Wang <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Yang Jihong <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Christophe JAILLET <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ handle the similar code in util/probe-event.c ]
Signed-off-by: Namhyung Kim <[email protected]>

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