cmov: add CmovEq impl for slices (#954) #434

Job	Run time
aarch64 (aarch64-unknown-linux-gnu, 1.60.0)	4m 12s
build (1.60.0, armv7a-none-eabi)	3m 44s
aarch64 (aarch64-unknown-linux-gnu, stable)	49s
cross (powerpc-unknown-linux-gnu, 1.60.0)	5m 0s
build (1.60.0, thumbv7em-none-eabi)	4m 3s
cross (powerpc-unknown-linux-gnu, stable)	51s
build (1.60.0, wasm32-unknown-unknown)	4m 25s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	5m 3s
build (stable, armv7a-none-eabi)	19s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	57s
build (stable, thumbv7em-none-eabi)	18s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	3m 50s
build (stable, wasm32-unknown-unknown)	18s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	29s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	4m 26s
test (x86_64-apple-darwin, macos-latest, stable)	30s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	5m 0s
test (x86_64-pc-windows-msvc, windows-latest, stable)	1m 39s
minimal-versions / minimal-versions	1m 3s
	46m 56s

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