[Bug 250580] VMware UEFI guests crash in virtual hardware after r366691

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250580

            Bug ID: 250580
           Summary: VMware UEFI guests crash in virtual hardware after
                    r366691
           Product: Base System
           Version: Unspecified
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: prj at rootwyrm.com

Confirmed using multiple guests, all amd64. The breaking commit was the MFS12
of r366422 and r366588. UEFI guests prior to that MFS are able to successfully
boot reliably. No extra crap. It Just Worked(TM).

Any attempt after this results in an immediate crash and full power off of the
VM (AHCI signaled) at the point of switching to UEFI console, AFTER reporting
which console is being switched to.
Bifurcating the MFS into the original commits did not help either. The only fix
that worked was backing out all of r366691.

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