Add a rudimentary test to run through all the available counters on a system and then execute a program with pmcstat in counting mode.
Add a rudimentary test to run through all the available counters on a
system and then execute a program with pmcstat in counting mode.

The program will verify that all counters fire and that the code neither
panics the system nor locks it up.  This should be considered a first pass
conformance test for new sets of counters being added to hwpmc(4).

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