cmov

cmov: add CmovEq for slices #322

Job	Run time
build (1.60.0, thumbv7em-none-eabi)	3m 37s
cross (aarch64-unknown-linux-gnu, 1.60.0)	4m 40s
build (1.60.0, wasm32-unknown-unknown)	3m 46s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	4m 6s
cross (aarch64-unknown-linux-gnu, stable)	51s
build (stable, thumbv7em-none-eabi)	17s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	3m 39s
cross (powerpc-unknown-linux-gnu, 1.60.0)	5m 21s
build (stable, wasm32-unknown-unknown)	21s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	47s
cross (powerpc-unknown-linux-gnu, stable)	35s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	4m 23s
minimal-versions / minimal-versions	22s
	32m 45s

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