sm4: simd support for armv8, x86_64 #930

Job	Run time
test (1.85.0)	24s
test (stable)	16s
build (stable, wasm32-unknown-unknown)	16s
build (stable, thumbv7em-none-eabi)	20s
build (1.85.0, thumbv7em-none-eabi)	17s
build (1.85.0, wasm32-unknown-unknown)	23s
minimal-versions	0s
	1m 56s

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