`aarch64` backend implementation #186

Job	Run time
Miri (x86_64-unknown-linux-gnu, --no-default-features)	57s
Miri (x86_64-unknown-linux-gnu)	1m 16s
Miri (x86_64-unknown-linux-gnu, --all-features)	1m 20s
Miri (aarch64-unknown-linux-gnu, --no-default-features)	41s
Miri (aarch64-unknown-linux-gnu)	43s
Test (x86_64-unknown-linux-gnu, nightly)	32s
Test (x86_64-unknown-linux-gnu, beta)	22s
Test (x86_64-unknown-linux-gnu, stable)	24s
Test (x86_64-unknown-linux-gnu, 1.64)	24s
Test (aarch64-unknown-linux-gnu, nightly)	49s
Test (aarch64-unknown-linux-gnu, beta)	39s
Test (aarch64-unknown-linux-gnu, stable)	59s
Test (aarch64-unknown-linux-gnu, 1.64)	58s
Clippy	21s
feature checks	27s
Fuzz	38s
docs	23s
fmt	17s
Outdated	0s
	12m 10s

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