The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.08.27.15.50.39 sevan src/sbin/gpt/main.c,v 1.12 2018.08.27.16.04.32 riastradh src/sys/external/bsd/drm2/nouveau/files.nouveau,v 1.20 2018.08.27.16.04.45 riastradh src/usr.bin/config/defs.h,v 1.104 2018.08.27.16.06.01 riastradh src/sys/external/bsd/drm2/amdgpu/files.amdgpu,v 1.7 2018.08.27.16.06.01 riastradh src/sys/external/bsd/drm2/i915drm/files.i915drmkms,v 1.32 2018.08.27.16.06.01 riastradh src/sys/external/bsd/drm2/nouveau/files.nouveau,v 1.21 2018.08.27.16.06.01 riastradh src/sys/external/bsd/drm2/radeon/files.radeon,v 1.21 2018.08.27.16.14.55 riastradh src/sys/external/bsd/drm2/dist/drm/i915/i915_gpu_error.c,v 1.10 2018.08.27.16.15.09 riastradh src/sys/external/bsd/drm2/i915drm/intel_gtt.c,v 1.10 2018.08.27.16.15.09 riastradh src/sys/external/bsd/drm2/include/drm/intel-gtt.h,v 1.7 2018.08.27.16.15.23 riastradh src/sys/external/bsd/drm2/i915drm/intel_gtt.c,v 1.11 2018.08.27.16.15.34 riastradh src/sys/external/bsd/drm2/dist/drm/i915/i915_vgpu.c,v 1.4 2018.08.27.16.15.48 riastradh src/sys/external/bsd/drm2/dist/drm/i915/i915_vgpu.h,v 1.3 2018.08.27.16.16.02 riastradh src/sys/arch/sparc64/include/bus_funcs.h,v 1.4 2018.08.27.16.16.16 riastradh src/sys/arch/sparc64/include/bus_funcs.h,v 1.5 2018.08.27.16.20.35 riastradh src/sys/external/bsd/drm2/include/drm/drm_os_netbsd.h,v 1.12 2018.08.27.16.29.18 riastradh src/sys/arch/i386/conf/ALL,v 1.450 2018.08.27.16.30.51 riastradh src/sys/arch/amd64/conf/ALL,v 1.100 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.08.html#2018.08.27.16.30.51