Work around a problem on the t5120 where top(1) would lock up the system for several minutes by making pmap_resident_count() return 0 for the kernel pmap.
Work around a problem on the t5120 where top(1) would lock up the system for
several minutes by making pmap_resident_count() return 0 for the kernel pmap.

discussed with miod@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars