CRC32C Parallel Computation Optimization on ARM

Hi all

This patch uses a parallel computing optimization algorithm to improve crc32c computing performance on ARM. The algorithm comes from Intel whitepaper: crc-iscsi-polynomial-crc32-instruction-paper. Input data is divided into three equal-sized blocks.Three parallel blocks (crc0, crc1, crc2) for 1024 Bytes.One Block: 42(BLK_LENGTH) * 8(step length: crc32c_u64) bytes

Crc32c unitest: https://gist.github.com/gaoxyt/138fd53ca1eead8102eeb9204067f7e4
Crc32c benchmark: https://gist.github.com/gaoxyt/4506c10fc06b3501445e32c4257113e9
It gets ~2x speedup compared to linear Arm crc32c instructions.

I'll create a CommitFests ticket for this submission.
Any comments or feedback are welcome.

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