aarch64-dit: initial crate #541

Job	Run time
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	3m 21s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	2m 31s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	2m 58s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	2m 19s
build (1.60.0, thumbv7em-none-eabi)	2m 30s
build (1.60.0, wasm32-unknown-unknown)	2m 33s
cross (aarch64-unknown-linux-gnu, 1.60.0)	2m 46s
build (stable, thumbv7em-none-eabi)	7s
cross (aarch64-unknown-linux-gnu, stable)	25s
build (stable, wasm32-unknown-unknown)	22s
cross (powerpc-unknown-linux-gnu, 1.60.0)	2m 49s
cross (powerpc-unknown-linux-gnu, stable)	25s
minimal-versions / minimal-versions	41s
	23m 47s

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