Initial aarch64 backend implementation #191

Job	Run time
docs	25s
feature checks	30s
Clippy	29s
Fuzz	41s
Miri (x86_64-unknown-linux-gnu, --no-default-features)	57s
Miri (x86_64-unknown-linux-gnu)	1m 10s
Miri (x86_64-unknown-linux-gnu, --all-features)	1m 17s
Miri (aarch64-unknown-linux-gnu, --no-default-features)	52s
Miri (aarch64-unknown-linux-gnu)	51s
Test (x86_64-unknown-linux-gnu, nightly)	22s
Test (x86_64-unknown-linux-gnu, beta)	43s
Test (x86_64-unknown-linux-gnu, stable)	28s
Test (x86_64-unknown-linux-gnu, 1.64)	32s
Test (aarch64-unknown-linux-gnu, nightly)	52s
Test (aarch64-unknown-linux-gnu, beta)	42s
Test (aarch64-unknown-linux-gnu, stable)	46s
Test (aarch64-unknown-linux-gnu, 1.64)	58s
fmt	13s
Outdated	12s
	13m 0s

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