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When the 64bit atomics simulation is in use, we can't necessarily guarantee the correct alignment of the atomics due to lack of compiler support for doing so- that's fine from a safety perspective, because everything is protected by a lock, but we asserted the alignment in all cases. Weaken them. Per complaint from Alvaro Herrera. My #ifdefery for PG_HAVE_8BYTE_SINGLE_COPY_ATOMICITY wasn't sufficient. Fix that. Per complaint from Alexander Korotkov.