Support signed integers for `bswap` intrinsic (#174) #169

Job	Run time
cargo-deny	1m 20s
Lint	5m 59s
Test (ubuntu-20.04, x86_64-unknown-linux-gnu)	16m 5s
Test (windows-2022, x86_64-pc-windows-msvc)	28m 28s
Test (macOS-latest, x86_64-apple-darwin)	13m 8s
Test (ubuntu-20.04, aarch64-linux-android, x86_64-unknown-linux-gnu)	7m 30s
test_success	1s
	1h 12m 31s

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