Provide ACCESS_ONCE and use it where it was inlined in READ_ONCE and
WRITE_ONCE. This will allow us to use the Linux KPI version of
compiler.h rather than the ancient copy of it for OpenZFS.
Sponsored by: Netflix
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It does undo the ACCESS_ONCE part of it, but doesn't undo the proper uintptr_t casting part. Oh, but I see the const cast is there for READ...
I can omit that bit too. OpenZFS really just reads READ_ONCE and WRITE_ONCE anyway. It
suffers from defining this stuff in too many different places :(.
So once I do all that, I can just drop this commit....