[Bug 230888] Missing 64 bit atomic functions for i386

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230888

--- Comment #4 from Conrad Meyer <cem at freebsd.org> ---
(In reply to David Chisnall from comment #3)
Seems like a C lock implementation for large types is allowed to place the lock
in the shared memory with the object.  (Not that using shared memory or _Atomic
structs is necessarily a good idea.)

"The size, representation, and alignment of an atomic type need not be the same
as those of the corresponding unqualified type."

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