Fixes for perf/urgent

. Set name of tracepoints when reading the perf.data headers, so that
  we don't end up using the local ones, from /sys.

. Fix default output file for perf stat, from Stephane Eranian.

. Fix endian handling of features bitmask in perf.data header, from David Ahern

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