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intr/x86: remove normal interrupts from intrcnt/intrnames
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Authored by ehem_freebsd_m5p.com on Feb 8 2023, 9:07 PM.
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Summary

These counters are now used strictly for IPI/PPI interrupts. Purge
support for normal interrupts as those are now *strictly* on intr_event.

The comment at the nintrcnt computation was incorrect. Multiple
hypervisor drivers use a per-core set of interrupts, but generally only
one hypervisor driver will be loaded.

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rG FreeBSD src repository
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Buildable 49640
Build 46530: arc lint + arc unit