Reduce vortex-fastlanes debug symbols by halving `unchecked_unpack_cmp` monomorphization #4043

Job	Run time
Rust publish dry-run	24s
check-java-publish-build (aarch64-unknown-linux-gnu, runs-on=27829793492/runner=arm64-medium/imag...	53s
check-java-publish-build (x86_64-unknown-linux-gnu, runs-on=27829793492/runner=amd64-medium/image...	47s
Python (wheel build)	5m 12s
Compat check / compat-test	2m 59s
	10m 15s

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