[Bug runtime/15727] perf probes fail on rawhide

[dsmith at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=15727

--- Comment #1 from David Smith <dsmith at redhat dot com> ---
After lots of debugging, I've found that some of the hardware perf probe types
aren't supported, especially on intel-based systems. Verified by running
'perf':

====
# perf stat --event=cpu-cycles ./towers.x

 Performance counter stats for './towers.x':

   <not supported> cpu-cycles              

       0.233646211 seconds time elapsed
====

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