Hmm, could define a macro DECLARE_ATOMIC_BITMAP(maxbit) that expands to the smallest
possible type for each architecture. And a couple of ugly casts for set_bit et.al.
but those could be also hidden in macros. Should be relatively easy to do.

or make a "smallbit" type that is small/supported, so 64 bit if 32 bit
isn't supported, otherwise 32


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