Fix inverted conditions in count_(leading|trailing)_zeros for 64-bit … #418

Job	Run time
Lint	6m 30s
Test (windows-2022, x86_64-pc-windows-msvc)	27m 6s
Test (macOS-latest, x86_64-apple-darwin)	15m 56s
Test (ubuntu-24.04, x86_64-unknown-linux-gnu)	15m 45s
cargo-deny	55s
Test (ubuntu-24.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	7m 34s
test_success	2s
	1h 13m 48s

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