MFV: less v458.

MFC after:	2 weeks
Pull in r181286 from upstream llvm trunk:

  LoopVectorize: getConsecutiveVector must respect signed arithmetic

  We were passing an i32 to ConstantInt::get where an i64 was needed and we must
  also pass the sign if we pass negatives numbers. The start index passed to
  getConsecutiveVector must also be signed.

  Should fix PR15882.

This should fix Firefox crashes some people have been reporting, when it
is compiled with -O3.
Bandaid for compiling with gcc, which happens to be the default compiler
for a number of platforms still.
The HPN patch added a new BUG bit for SSH_BUG_LARGEWINDOW
and the update to 6.1 added SSH_BUG_DYNAMIC_RPORT with the
same value.

Fix the HPN SSH_BUG_LARGEWINDOW bit so it is unique.

Approved by:	des
MFC after:	2 weeks
Add a remark to the effect that a manually started relearn will always
result in the battery being completely drained, even in transparent learning
mode.

MFC in:		3 days
Sponsored by:	Sandvine Inc.
o Add accessor functions to add and remove pages from a specific
  freelist.
o Split the pool of free pages queues really by domain and not rely on
  definition of VM_RAW_NFREELIST.
o For MAXMEMDOM > 1, wrap the RR allocation logic into a specific
  function that is called when calculating the allocation domain.
  The RR counter is kept, currently, per-thread.
  In the future it is expected that such function evolves in a real
  policy decision referee, based on specific informations retrieved by
  per-thread and per-vm_object attributes.
o Add the concept of "probed domains" under the form of vm_ndomains.
  It is responsibility for every architecture willing to support multiple
  memory domains to correctly probe vm_ndomains along with mem_affinity
  segments attributes.  Those two values are supposed to remain always
  consistent.
  Please also note that vm_ndomains and td_dom_rr_idx are both int
  because segments already store domains as int.  Ideally u_int would
  have much more sense. Probabilly this should be cleaned up in the
  future.
o Apply RR domain selection also to vm_phys_zero_pages_idle().

Sponsored by:	EMC / Isilon storage division
Partly obtained from:	jeff
Reviewed by:	alc
Tested by:	jeff
mdoc sweep
Set st_nlink in the stat structure within the inode to 1 as well.
The cd9660 file system uses that field for the link count and it
was 0. This impacts pwd_mkdb(8) as it checks for st_nlink not being
0 as part of closing a race.
Begin tidying up the reassociation and node sleep/wakeup paths.

* Move the node sleep/wake state under the TX lock rather than the
  node lock.  Let's leave the node lock protecting rate control only
  for now.

* When reassociating, various state needs to be cleared.  For example,
  the aggregate session needs to be torn down, including any pending
  aggregation negotiation and BAR TX waiting.

* .. and we need to do a "cleanup" pass since frames in the hardware
  TX queue need to be transmitted.

Modify ath_tx_tid_cleanup() to be called with the TX lock held and push
frames into a completion list.  This allows for the cleanup to be
done atomically for all TIDs in a node rather than grabbing and
releasing the TX lock each time.
This lock only protects the rate control state for now, mention this.
Oops, commit the other half of r250606.
Since the node state is 100% back under the TX lock, just kill the use
of atomics.

I'll re-think this nonsense later.
Improve the debugging output - use the MAC address rather than various
pointer values everywhere.
As python3 does not have raw_input(), convert it to input() when we
are using python3.

PR:	177214
Reviewed by:	gnn
Approved by:	sbruno (mentor)
Fix typo in net.inet.tcp.minmss sysctl description.

MFC after:	3 days
Deal correctly with 40G ports that don't have any transceiver plugged
in.  Do not claim that they have unknown tranceivers.

MFC after:	3 days
Remove a bogus re-assignment.

MFC after:	3 days
Use an ugly hack to get around bootstrapping problems when building
clang on head between r239347 and r245428.

The former revision introduced CLOCK_PROCESS_CPUTIME_ID as a clock id
for the clock_gettime() function and friends, but it was only added in
<sys/time.h>, not in <time.h>.  Any program including <time.h> would
therefore not be able to use CLOCK_PROCESS_CPUTIME_ID, even though the
value of _POSIX_CPUTIME indicates its existence.  The latter revision
synchronized the defines again.

Work around this problem by defining the id on the command line for the
particular .cpp file that needs it.  If the id ever changes value, this
hack will need to be updated.
etc/rc.d/syslogd
	Add netif as a requirement of syslogd to get lo0 up.  Currently, this
	doesn't affect the rc order, because mountcritremote already depends on
	netif.

Reviewed by:	eadler
Approved by:	kenm (mentor)
MFC after:	2 weeks
Support sending ATH_ALQ messages with no payload.