perf jevents.py: Ensure event names aren't duplicated

Duplicate event names break invariants in 'perf list'. Assert that an
event name isn't duplicated so that broken JSON won't build.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Atish Patra <[email protected]>
Cc: Changbin Du <[email protected]>
Cc: Charles Ci-Jyun Wu <[email protected]>
Cc: Eric Lin <[email protected]>
Cc: Greentime Hu <[email protected]>
Cc: Guilherme Amadio <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Inochi Amaoto <[email protected]>
Cc: James Clark <[email protected]>
Cc: Ji Sheng Teoh <[email protected]>
Cc: Jing Zhang <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Locus Wei-Han Chen <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Samuel Holland <[email protected]>
Cc: Sandipan Das <[email protected]>
Cc: Vincent Chen <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Xu Yang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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