Given a performance metric semantic, pmSemStr produces a terse ASCII
equivalent, appropriate for use in error and diagnostic messages.
The pmSemStr_r function does the same, but stores the result in a
user-supplied buffer buf of length buflen, which should have room for
at least 20 bytes.
The value for sem is typically extracted from a pmDesc structure,
following a call to pmLookupDesc(3) for a particular performance
Examples are counter (for sem equals PM_SEM_COUNTER), discrete (for
sem equals PM_SEM_DISCRETE), instant (for sem equals PM_SEM_INSTANT),
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