The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2023.04.11.06.42.30 msaitoh src/sys/arch/x86/include/specialreg.h,v 1.206 Logs can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2023.04.html#2023.04.11.06.42.30