The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2020.04.20.19.20.35 bouyer src/sys/arch/xen/xen/xbdback_xenbus.c,v 1.84 2020.04.20.19.29.09 jdolecek src/sys/arch/xen/xen/xbdback_xenbus.c,v 1.85 2020.04.20.20.03.21 bouyer src/sys/arch/xen/xen/xengnt.c,v 1.36 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2020.04.html#2020.04.20.20.03.21