[Bug 254532] hwpmc: sampling mode aliases non-functional on arm64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254532

            Bug ID: 254532
           Summary: hwpmc: sampling mode aliases non-functional on arm64
           Product: Base System
           Version: 13.0-STABLE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: emaste at freebsd.org

Attempting to run a basic system-wide sampling mode profiling fails:

# pmcstat -S unhalted-cycles -O /tmp/sample.out
pmcstat: ERROR: Cannot allocate system-mode pmc with specification
"unhalted-cycles": Invalid argument

# uname -a
FreeBSD generic 13.0-RC3 FreeBSD 13.0-RC3 #0 n244697-16c1f81f11a: Fri Mar 12
09:29:50 UTC 2021    
root at generic:/usr/obj/root/freebsd/arm64.aarch64/sys/GENERIC  arm64

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