This changes STACKALIGN to be type-preserving when operating on
pointers.

Reviewed by:	brooks, kib
Effort:		CHERI upstreaming
Sponsored by:	AFRL, DARPA
Differential Revision:	https://reviews.freebsd.org/D54920

No functional change intended.

Reviewed by:	olce, kib, emaste
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D53062

Sponsored by:	Klara, Inc.

Implement the Linux inotify system calls using the native implementation
in vfs_inotify.c.

PR:		240874
Reviewed by:	brooks
MFC after:	3 months
Sponsored by:	Klara, Inc.
Differential Revision:	https://reviews.freebsd.org/D50761

The adds the parts needed to export the new AT_HWCAP3 and 4 from the
kernel.

Reviewed by:	brooks, imp, kib
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D51008

It is likely we will need these on arm64. Add them in preparation for
flags in these to be added at some point in the future.

Reviewed by:	brooks, imp, kib
Sponsored by:	Arm Ltd
Differential Revision:	https://reviews.freebsd.org/D51005

Switch to using sys/stdarg.h for va_list type and va_* builtins.

Make an attempt to insert the include in a sensible place.  Where
style(9) was followed this is easy, where it was ignored, aim for the
first block of sys/*.h headers and don't get too fussy or try to fix
other style bugs.

Reviewed by:	imp
Exp-run by:	antoine (PR 286274)
Pull Request:	https://github.com/freebsd/freebsd-src/pull/1595

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week