[Bug 294480] do not boot with custom partition layout

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294480

            Bug ID: 294480
           Summary: do not boot with custom partition layout
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: sergey@fidoman.ru

Created attachment 269720
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=269720&action=edit
patch

Hello, 
I tried to install FreeBSD in VM with minimalistic disk layout:
1) only BSD disklabel (no DOS/GPT partition table)
2) reordered partitions - swap first, UFS second (to be able to expand UFS
without touching swap).

=>        0  266338304  da0  BSD  (127G)
          0    2097152    1  freebsd-swap  (1G)
    2097152   33554432    2  freebsd-ufs  (16G)
   35651584  230686720       - free -  (110G)

After install system refused to boot - missing /boot/kernel/kernel message or
something
Manually sepcifying 0:ad(0,b)/boot/loader allowed to boot system.
I examined boot2.c and found that it use only very first partition to boot (and
even without initialization of part no.). So here is patch that makes boot2 to
scan all partitions for valid loader. After applying, making and gpart bootcode
-b with file from /user/obj system began to boot without manual intervention.

(maybe patch -l is needed due to space/tab differences)

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