The sn driver doesn't actually include microcode at the current time,
although it may in the future. Or not since the ositech cards that
might need it have become perhaps too rare to support.
Turns out, this isn't only called from i386...
Inject #UD into the guest when it executes either 'MONITOR' or 'MWAIT' on
an AMD/SVM host.

MFC after:	1 week
Add arm option ARM_NEW_PMAP, to allow us to begin adding the new pmap
code alongside the existing implementation and quickly toggle between
the two implementations when testing.  Once the new code is past its
teething stage we can remove this option.
Add armv6 implementations of these cache operations to avoid duplicating
the #ifdef stuff at multiple points the functions are called from.  Also
rework the armv7 implementations so that the invalidate operations work
from outermost to innermost cache level, and the writeback works from
inner to outer levels.
Export MAXCPU to the assembler code, needing by upcoming changes to locore.S.
Rename locore.S to locore-v4.S and add a new locore-v6.S for starting up
armv6/7 systems.  We need to use some new armv6/7 features at startup
and splitting the implemenations to separate files will be more maintainable
than adding even more #ifdef sections to locore.S.

Because of the standardized interfaces to cache and MMU operations in armv7,
we can tolerate the kernel being entered with caches enabled.  This allows
running u-boot and loader(8) with caches enabled, and the performance
improvement can be dramatic (boot times can be cut from over a minute
to under 30 seconds).  The new implementation also has more robust cache
and mmu sequences for launching AP cores, and it paves the way for
upcoming changes to the pmap code which will use the TEX remap feature.

Changes in mp_machdep.c work with the new behavior in locore-v6 mp_entry,
and also reuse the original boot-time page tables to get transitioned
from physical to virtual addressing before installing the normal tables.

Submitted by Svatopluk Kraus and Michal Meloun with some changes by me.
Add a new locore.S that #includes the right (v4 or v6) implementation.
The kernel build machinery really wants the entry point to be in a file
named locore.S so doing this avoids a bunch of changes to the build system
for relatively little benefit.
Update elftoolchain to upstream rev 3136

This fixes two strip(1) issues found during ports exp-run and adds a
string hash implementation which significantly speeds up certain
operations on objects with large numbers of symbols.

This also improves libdwarf handling for stripped objects with
.eh_frame or .debug_frame (but not other debug) sections.

PR:		196107
Sponsored by:	The FreeBSD Foundation
Use the correct loader.conf(5) entry for deferring the
mountroot prompt.

Prodded by:	ian
Sponsored by:	The FreeBSD Foundation