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This change adds support for AMD's UMC performance counters. It is a bit more complicated than existing counters because the enable bit has moved. This supports Zen 4 through most Zen 6 chips as UMC counters are per-node, where a node does not necessarily translate to a NUMA domain. A few follow up changes to PMC will address this limitation. Reviewed by: mhorne Sponsored by: Netflix Pull Request: https://github.com/freebsd/freebsd-src/pull/2368