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This patch adds support for AMD IBS. It adds a new class of performance
counter that cotains two events: ibs-fetch and ibs-op events. Unlike
most existing sampled events, IBS events provide a number of values
containing extra information regarding the sample. To support this we
use the existing callchain event, and introduce a new flag for multipart
payloads. The first 8 bytes of the pc_sample contains a header that
defines up to four payloads.
Sponsored by: Netflix
Reviewed by: imp,mhorne
Pull Request: https://github.com/freebsd/freebsd-src/pull/2022
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