`aarch64` backend implementation #194

Job	Run time
Miri (x86_64-unknown-linux-gnu, --no-default-features)	1m 10s
Miri (x86_64-unknown-linux-gnu)	1m 28s
Miri (x86_64-unknown-linux-gnu, --all-features)	1m 4s
Miri (aarch64-unknown-linux-gnu, --no-default-features)	1m 1s
Miri (aarch64-unknown-linux-gnu)	53s
Test (x86_64-unknown-linux-gnu, nightly)	29s
Test (x86_64-unknown-linux-gnu, beta)	25s
Test (x86_64-unknown-linux-gnu, stable)	22s
Test (x86_64-unknown-linux-gnu, 1.64)	23s
Test (aarch64-unknown-linux-gnu, nightly)	57s
Test (aarch64-unknown-linux-gnu, beta)	50s
Test (aarch64-unknown-linux-gnu, stable)	48s
Test (aarch64-unknown-linux-gnu, 1.64)	1m 5s
Clippy	23s
docs	23s
feature checks	32s
fmt	13s
Fuzz	39s
Outdated	0s
	13m 5s

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