Use AtomicCell<u64> on targets with target_has_atomic less than 64#286

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taiki-e wants to merge 3 commits intoasync-rs:masterfrom taiki-e:atomic

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Commits on Jan 29, 2020

Use AtomicCell<u64> on targets with target_has_atomic less than 64
taiki-e
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Temporarily ignore io_timeout:: io_timeout_timedout test on non x86-64 targets
taiki-e
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Revert "Temporarily ignore io_timeout:: io_timeout_timedout test on non x86-64 targets"
taiki-e
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