The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2017.03.21.02.24.35 ozaki-r src/sys/uvm/uvm_bio.c,v 1.89 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2017.03.html#2017.03.21.02.24.35