cmov

cmov: (NonZero){u,i}size improvements #1104

Job	Run time
test-careful	1m 29s
build (stable, thumbv7em-none-eabi)	15s
build (1.85.0, wasm32-unknown-unknown)	19s
test-miri (x86_64-unknown-linux-gnu)	1m 11s
build (1.85.0, thumbv7em-none-eabi)	20s
test-miri (s390x-unknown-linux-gnu)	1m 28s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	1m 9s
test-miri (powerpc-unknown-linux-gnu)	1m 26s
build (stable, wasm32-unknown-unknown)	12s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	1m 38s
test-cross (powerpc-unknown-linux-gnu, stable)	1m 18s
test (x86_64-apple-darwin, macos-latest, 1.85.0)	55s
test-cross (armv7-unknown-linux-gnueabi, stable)	1m 12s
minimal-versions / minimal-versions	1m 3s
test-cross (riscv64gc-unknown-linux-gnu, stable)	1m 33s
test-cross (aarch64-unknown-linux-gnu, 1.85.0)	1m 10s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	45s
test-cross (aarch64-unknown-linux-gnu, stable)	1m 10s
test-cross (armv7-unknown-linux-gnueabi, 1.85.0)	1m 8s
test-cross (powerpc-unknown-linux-gnu, 1.85.0)	1m 14s
	20m 55s

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