Fix go panic caused by unaligned atomic fields on certain architectures. #4729
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On certain architectures (such as ARM and x86_32) the misalignment of these fields will cause a panic when an update is attempted.
On a side note, I've only checked this part of the repo - I came across this as it is depended on by ThalesIgnite/crypto11 - More checking might be required to fix this if it occurs in other places.
Relates to golang/go#599 and golang/go#23345