The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2022.09.02.05.09.49 kre src/sys/arch/xen/xen/xenmem.c,v 1.4 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2022.09.html#2022.09.02.05.09.49