perf stat branch: perf stat fails on unsupported event

[David Ahern]

Tried the perf stat branch this morning. perf stat fails with:

# /tmp/build-perf/perf stat -- sleep 1
  Error: stalled-cycles-frontend event is not supported.
  Fatal: Not all events could be opened.

This is a Dell R410 with an E5620 processor.

David
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