Add hardware crc impl
Summary: A faster crc32 impl for folly. Similar to crc32c, except intel doesn't provide crc32 directly in hardware - instead, pclmul can be used, which is ~2x slower than crc32c, but still ~5-10x faster than software implementation. Reviewed By: Orvid, yfeldblum Differential Revision: D4994761 fbshipit-source-id: ad8ba856649eea6dc7b541d561329ff7d7fe2d60
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