port-i386/57000: i386 install fails with panic: x86_hotpatch_apply failed

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

>Number:         57000
>Category:       port-i386
>Synopsis:       i386 install fails with panic: x86_hotpatch_apply failed
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Sep 07 13:40:00 +0000 2022
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2022.09.07.00.34.19
>Organization:
  
>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

The TNF i386 testbed is now failing at the install stage, with the
INSTALL kernel reporting "panic: x86_hotpatch_apply failed":

  http://releng.netbsd.org/b5reports/i386/commits-2022.09.html#2022.09.07.00.40.19

This is installing NetBSD/i386 in a qemu VM using NVMM acceleration.

The problem appears to have started with knakahara's commit
of 2022.09.07.00.40.19 with the commit message

  NetBSD/x86: Raise the number of interrupt sources per CPU from 32 to 56.

  There has been no objection for three years.
      https://mail-index.netbsd.org/port-amd64/2019/09/22/msg003012.html
  Implemented by nonaka@n.o, updated by me.

>How-To-Repeat:

>Fix: