merge 1.2 mmu_pagein decl; 1.3-5 4/300 writethrough vac bug
merge 1.2 mmu_pagein decl; 1.3-5 4/300 writethrough vac bug

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