Fix autofs debug macros.

MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Allow the optional limitation on dmb instructions as is already the case
with dsb instructions.
Add all the dmb/dsb optional limitations, including the alternative values.
These are needed for some code llvm generates when targeting ARMv7.
Fix various issues with zvols

When performing snapshot renames we could deadlock due to the locking
in zvol_rename_minors. In order to avoid this use the same workaround
as zvol_open in zvol_rename_minors.

Add missing zvol_rename_minors to dsl_dataset_promote_sync.

Protect against invalid index into zv_name in zvol_remove_minors.

Replace zvol_remove_minor calls with zvol_remove_minors to ensure
any potential children are also renamed.

Don't fail zvol_create_minors if zvol_create_minor returns EEXIST.

Restore the valid pool check in zfs_ioc_destroy_snaps to ensure we
don't call zvol_remove_minors when zfs_unmount_snap fails.

PR:		193803
MFC after:	1 week
Sponsored by:	Multiplay
Bump .Dd

Approved by:	kevlo
Allow vld and vst instructions to use the canonical form from ARM ARM when
including an alignment. Previously binutils would only allow instructions
in the form "vld1.64 {d0, d1}, [r0, :128]" where the final comma should
not be there, instead the above instruction should be
"vld1.64 {d0, d1}, [r0:128]".

This change duplicates the alignment code from within the function to
handle this case.
Fix XHCI driver for devices which have more than 15 physical root HUB
ports. The current bitmap array was too small to hold more than 16
bits and would at some point toggle the context size, which then would
trigger an enumeration fault and cause a fallback to the EHCI
companion controller, if any.

MFC after:	3 days
Merge remote-tracking branch 'freebsd/master' into hardened/current/master
Merge remote-tracking branch 'origin/hardened/current/master' into hardened/current/segvguard