Rename some functions so any atomic ops from this file and/or <sys/atomic.h> can be used. May want to pare overlap in the future, but let's leave both options for now

Import later FreeBSD version, add note about atomic.S which contains similar functions.

Initial import of arch/ia64 sources.
These sources are ported from FreeBSD/ia64 code.
See individual source files for credits.
In addition, code from NetBSD/alpha NetBSD/sparc64,
NetBSD/i386 and NetB

Initial import of arch/ia64 sources.
These sources are ported from FreeBSD/ia64 code.
See individual source files for credits.
In addition, code from NetBSD/alpha NetBSD/sparc64,
NetBSD/i386 and NetBSD/amd64 were used as templates,
along with my own additions.

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