cpufeatures: add support for aarch64's sm4 target feature (#972) #467

Job	Run time
aarch64 (aarch64-unknown-linux-gnu, 1.60.0)	5m 12s
aarch64 (aarch64-unknown-linux-gnu, stable)	1m 19s
build (1.60.0, armv7a-none-eabi)	4m 54s
cross (powerpc-unknown-linux-gnu, 1.60.0)	6m 4s
build (1.60.0, thumbv7em-none-eabi)	5m 22s
cross (powerpc-unknown-linux-gnu, stable)	46s
build (1.60.0, wasm32-unknown-unknown)	4m 26s
build (stable, armv7a-none-eabi)	10s
build (stable, thumbv7em-none-eabi)	30s
build (stable, wasm32-unknown-unknown)	17s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	6m 38s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	48s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	4m 40s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	23s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	5m 50s
test (x86_64-apple-darwin, macos-latest, stable)	48s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	7m 36s
test (x86_64-pc-windows-msvc, windows-latest, stable)	2m 2s
minimal-versions / minimal-versions	5m 17s
	1h 3m 2s

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