Revert `u8to64_le` changes from #68914.#69332

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bors merged 1 commit intorust-lang:masterfrom nnethercote:revert-u8to64_le-changes

Feb 22, 2020

+46-13

Commits on Feb 20, 2020

Revert u8to64_le changes from rust-lang#68914 .
nnethercote
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