MFC r260978:
Add check for "hw.usb.no_pf" sysctl value.
MFC r261162:

Pull in r195679 from upstream llvm trunk:

  Don't use nopl in cpus that don't support it.

  Patch by Mikulas Patocka. I added the test. I checked that for cpu names that
  gas knows about, it also doesn't generate nopl.

  The modified cpus:
  i686 - there are i686-class CPUs that don't have nopl: Via c3, Transmeta
	 Crusoe, Microsoft VirtualBox - see
	 https://bbs.archlinux.org/viewtopic.php?pid=775414
  k6, k6-2, k6-3, winchip-c6, winchip2 - these are 586-class CPUs
  via c3 c3-2 - see https://bugs.archlinux.org/task/19733 as a proof that
	 Via c3 and c3-Nehemiah don't have nopl

PR:		bin/185777
MFC 260910:
- Allow PCI devices that are attached to a driver to be identified by their
  device name instead of just the selector.
- Accept an optional device argument to -l to restrict the output to only
  listing details about a single device.  This is mostly useful in
  conjunction with other flags like -e or -c to allow a user to query
  details about a single device.
MFC r260267 (by smh), r261042:
Correct short delete issue in SCSI UNMAP support
Correct missing \n's in xpt_print's
Correct incorrect count being passed to short delete xpt_print
[automated] Merge in upstream-github/stable/9