The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.12.12.10.25.29 martin src/rescue/list,v 1.52 2018.12.12.10.42.34 maxv src/lib/libnvmm/libnvmm.c,v 1.4 2018.12.12.11.14.51 ryo src/sys/arch/aarch64/aarch64/cpuswitch.S,v 1.9 2018.12.12.11.14.51 ryo src/sys/arch/aarch64/aarch64/idle_machdep.S,v 1.3 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.12.html#2018.12.12.11.14.51