add `pclmulqdq` crc32 variant #115

Job	Run time
Build and test (stable, ubuntu-latest, x86_64-unknown-linux-gnu)	34s
Build and test (beta, ubuntu-latest, x86_64-unknown-linux-gnu)	39s
Clippy (x86_64-unknown-linux-gnu)	9s
Smoke-test fuzzing targets	1m 43s
Smoke-test fuzzing targets (--all-features)	45s
	3m 50s

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