perf/urgent fix:

- Add missing initialization of perf_sample.cpumode in synthesized samples,
  affects jitdump, records for pre-existing threads and records synthesized
  from processor trace data, noticed while testing intel_pt events with
  'perf script' (Arnaldo Carvalho de Melo)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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