Import lldb as of SVN r194122

Sponsored by:	DARPA, AFRL
Some more registers access optimizations:
 - Process ATIO queue only if interrupt status tells so;
 - Do not update queue out pointers after each processed command, do it
only once at the end of the loop.
Use relaxed (write-only) memory barriers when writing some of queue index
registers (for now on ISP2400+).  We never read those registers back and
AFAIK their semantics does not require any immediate reaction on write.
x86 platforms that use an IOAPIC route the legacy timer interrupt (IRQ0) to
pin 2 of the IOAPIC.

Add an 'Interrupt Source Override' entry to the MADT to describe this
and start asserting interrupts on pin 2 in the 8254 device model.

Submitted by:	Tycho Nightingale (tycho.nightingale@pluribusnetworks.com)
Update svn from 1.8.1 to 1.8.4 - minor security fixes and client side
merge handling bug fixes (reintegrate, mergeinfo etc)
Unbreak the installer on head/:

  When bsdinstall(8) sources the bsdconfig(8) common.subr file,
  PKG_ABI is set by calling 'pkg -vv' and searching for the ABI
  pkg(8) will use.

  When pkg(8) is run for the first time, the bootstrap process
  is run, which prompts for 'y/N' input from stdin if running with
  TERM set.

  Since TERM is set and it is the first time pkg(8) is run, which
  happens automatically, bsdinstall(8) hangs waiting for user input
  which is never displayed since a specific line is expected by
  awk(1), and stdin is expected by pkg(8).

  Set ASSUME_ALWAYS_YES=1, which will cause pkg(8) to assume the
  '-y' flag is also used for the bootstrap process, allowing
  bsdinstall(8) to proceed to the keymap lookup, otherwise
  bsdinstall(8) appears to hang after selecting 'Install' from the
  menu on first boot from CDROM.
Remove the env(1) but keep the var.
Check the partition scheme before blowing away disks, instead of after.
The effects of this patch would only be noticeable if you were purposefully
setting a bad value and trying to see what happens; and leaving the disks
intact if a bad value has been set seems fair.
Silence bmake(1) errors if TEST_DIRS evaluation is empty.
Add the necessary bits for dumps on ppc64.

MFC after:	2 weeks
Fix a few style nits.

MFC after:	3 days
X-MFC-After:	10.0-RELEASE
Sponsored by:	The FreeBSD Foundation
Remove never used ioctls that originate from KAME. The proof
of their zero usage was exp-run from misc/183538.
Do not use just freed memory.

Sponsored by:	Nginx, Inc.
Introduce seperate mutex lock to protect protect CTL I/O pools, slightly
reducing global CTL lock scope and congestion.

While there, simplify CTL I/O pools KPI, hiding implementation details.
Send EAPOL frames at the management rate, not the data rate.

Without this, a far away station with low signal strength would
associate using the management rate (by default the lowest rate)
and then the EAPOL frames would go out at the current AMRR best
guess.  This would result in association failing authentication.

Tested:

* Intel 5100, STA
* Intel 2230, STA
Use IWN_NBANDS rather than a hard-coded limit.

Tested:

* Intel 5100, STA
Fix off-by-one. Sorry!
Replace the hard-coded RX queue value check with IWN_UNSOLICITED_RX_NOTIF.
If A-MPDU transmission fails entirely, then no BA is received from the
NIC and pushed up to the driver.  Unfortunately this means there's
no rate control notification done.  Thus, if the rate control code
makes a decision that hits a crappy rate that can't succeed, the
rate code would never lower the rate and packet loss would continue.

So, fake some rate control notification in this case.
MFV r257952:

Upgrade to OpenSSH 6.4p1.

Bump VersionAddendum.

Approved by:	des