Extend UNMAP blacklist on all STEC SSD models.

None of existing STEC devices need UNMAP or even support it well, having
many limitations and even hanging sometimes executing those commands.
New devices that may use UNMAP going to be released under HGST name.

MFC after:	3 days
To workaround an errata on certain Pentium Pro CPUs, i386 disables
the local APIC in initializecpu() and re-enables it if the APIC code
decides to use the local APIC after all.  Rework this workaround
slightly so that initializecpu() won't re-disable the local APIC if
it is called after the APIC code re-enables the local APIC.
MFamd64: Use initializecpu() to set various model-specific registers on
AP startup and AP resume (it was already used for BSP startup and BSP
resume).
- Split code to do one-time probing of cache properties out of
  initializecpu() and into initializecpucache().  This is called once on
  the BSP during boot.
- Move enable_sse() into initializecpu().
- Call initializecpu() for AP startup instead of enable_sse() and
  manually frobbing MSR_EFER to enable PG_NX.
- Call initializecpu() when an AP resumes.  In theory this will now
  properly re-enable PG_NX in MSR_EFER when resuming a PAE kernel on
  APs.
Fix header output when -P is specified and (ncpus - 1) != maxid.

Reported by:	Hiroaki Shimizu
PR:		152738
Fix a bug which could break extended attributes in a dump output.
This occurred when a file was >892kB long and had a large data (>1kB)
in the extended attributes.

Reported by:	Masashi Toriumi
Reviewed by:	mckusick
Use the linker to perform relocations in the SUNW_dof section rather than
doing them in drti during startup. This fixes a number of problems with
using USDT probes in stripped executables and shared libraries, and with
USDT probes in static functions.

Reviewed by:	rpaulo
MFC after:	1 month
Sponsored by:	EMC / Isilon Storage Division
Phabric: 	D751
Update a stale comment.
Since r270929 raw sockets expect network byte order.

Submitted by:	avg
Add new a M_START() mbuf macro that returns a pointer to the start of
an mbuf's storage (internal or external).

Add a new M_SIZE() mbuf macro that returns the size of an mbuf's
storage (internal or external).

These contrast with m_data and m_len, which are with respect to data
in the buffer, rather than the buffer itself.

Rewrite M_LEADINGSPACE() and M_TRAILINGSPACE() in terms of M_START()
and M_SIZE().

This is done as we currently have many instances of using mbuf flags
to generate pointers or lengths for internal storage in header and
regular mbufs, as well as to external storage. Rather than replicate
this logic throughout the network stack, centralising the
implementation will make it easier for us to refine mbuf storage.
This should also help reduce bugs by limiting the amount of
mbuf-type-specific pointer arithmetic.  Followup changes will
propagate use of the macros throughout the stack.

M_SIZE() conflicts with one macro in the Chelsio driver; rename that
macro in a slightly unsatisfying way to eliminate the collision.

MFC after:	3 days
Obtained from:	jeff (with enhancements)
Sponsored by:	EMC / Isilon Storage Division
Reviewed by:	bz, glebius, np
Differential Revision:	https://reviews.freebsd.org/D753
* constify argument of in6_addrscope();
* use IN6_IS_ADDR_XXX() macro instead of hardcoded values;
* for multicast addresses just return scope value, the only exception
  is addresses with 0x0F scope value (RFC 4291 p2.7.0);

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
Rename pmap_kenter_temp to pmap_kenter_temporary to be consistent with the
other architectures with this function.

Submitted by:	Svatopluk Kraus <onwahe at gmail.com>
Submitted by:	Michal Meloun <meloun at miracle.cz>
- Add $netif_ipexpand_max to specify the upper limit for the number of
  addresses generated by an address range specification.  The default
  value is 2048.  This can be increased by setting $netif_ipexpand_max
  in rc.conf.

- Fix warning messages when an address range spec exceeds the upper limit.

PR:	186841
Introduce new scope related functions.

* new macro to remove magic number - IPV6_ADDR_SCOPES_COUNT;
* sa6_checkzone() - this function checks sockaddr_in6 structure
  for correctness of sin6_scope_id. It also can fill correct
  value sometimes.
* in6_getscopezone() - this function returns scope zone id for
  specified interface and scope.
* in6_getlinkifnet() - this function returns struct ifnet for
  corresponding zone id of link-local scope.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
* use M_ZERO flag with malloc instead of explicit zeroing.
* remove MULTI_SCOPE ifdef.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
Add const qualifier to in6_addrhash() function.
Add in6ifa_ifwithaddr() function. It is similar to ifa_ifwithaddr,
but does fast lookup in the hash of inet6 addresses.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
Persist vdev_resilver_txg changes to avoid panic caused by validation
vs a vdev_resilver_txg value from a previous resilver.

MFC after:	1 week
Add Reset Manager driver. This driver provides generic way to reset
and provides sysctl tunables for enable/disable FPGA<->HPS bridges.

Sponsored by:	DARPA, AFRL
Merge upstream Clang rev 205331 debuginfo crash fix:

    Debug info: fix a crash when emitting IndirectFieldDecls, which were
    previously not handled at all.
    rdar://problem/16348575

MFC after:	1 week
Sponsored by:	DARPA, AFRL
Add clang patch corresponding to r271432
Update motd, clarifying the information and adding pointers to other
resources.

MFC after:	3 days