port-i386/55314: i386 no longer boots

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         55314
>Category:       port-i386
>Synopsis:       i386 no longer boots
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu May 28 14:20:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2020.05.27.19.40.29
>Organization:
>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

The i386 INSTALL kernel is crashing at boot since these commits:

  2020.05.27.19.33.40 ad src/sys/arch/amd64/amd64/cpufunc.S 1.57
  2020.05.27.19.33.40 ad src/sys/arch/amd64/amd64/locore.S 1.209
  2020.05.27.19.33.40 ad src/sys/arch/i386/i386/cpufunc.S 1.43
  2020.05.27.19.33.40 ad src/sys/arch/i386/i386/locore.S 1.185
  2020.05.27.19.33.40 ad src/sys/arch/x86/include/pmap.h 1.122
  2020.05.27.19.33.40 ad src/sys/arch/x86/x86/pmap.c 1.396
  2020.05.27.19.40.29 ad src/sys/arch/x86/x86/svs.c 1.37

Logs:

  http://releng.netbsd.org/b5reports/i386/commits-2020.05.html#2020.05.27.19.40.29
  http://releng.netbsd.org/b5reports/i386/2020/2020.05.27.19.40.29/install.log

>How-To-Repeat:

>Fix: