Re-add aarch64 stuff removed by previous PR #1028
Merged
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Previous PR #1023 has removed stuff from mod.rs and added it to some submodules, but
missed the aarch64 submodule.
This caused a build failure for rust on aarch64, see rust-lang/rust#51864.
This copies the stuff that that commit added to the x86_64.rs submodule
and puts it into aarch64.rs.
It's been tested in the rust-lang/rust PR above: https://travis-ci.org/rust-lang/rust/builds/398750336