Adding atomic primops

[Johan Tibell]

I will update the wiki page (and later CmmSink) with the guarantees we
expect CallishMachOps to provide. We do need to pick what kind of guarantee
we want to provide. Options are here:
http://en.cppreference.com/w/cpp/atomic/memory_order

Do we want to have these CallishMachOps to imply a full memory fence CPU
instruction or some more relaxed ordering (e.g. only atomicity)?
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