cmov

cmov: fix `aarch64` ASM bug; add regression test (#1299) #866

Job	Run time
test-careful	1m 18s
test-miri (s390x-unknown-linux-gnu)	53s
build (1.85.0, thumbv7em-none-eabi)	14s
test-miri (powerpc-unknown-linux-gnu)	51s
test-cross (powerpc-unknown-linux-gnu, 1.85.0)	51s
test-cross (aarch64-unknown-linux-gnu, 1.85.0)	1m 0s
test-miri (x86_64-unknown-linux-gnu)	39s
test-cross (powerpc-unknown-linux-gnu, stable)	48s
test-cross (aarch64-unknown-linux-gnu, stable)	57s
minimal-versions / minimal-versions	41s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	35s
test (x86_64-apple-darwin, macos-latest, 1.85.0)	51s
build (stable, wasm32-unknown-unknown)	12s
build (1.85.0, wasm32-unknown-unknown)	19s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	1m 16s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	58s
build (stable, thumbv7em-none-eabi)	11s
	12m 34s

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