LU-1339 libcfs: add crc32 pclmulqdq implementation

Using hardware provided PCLMULQDQ instruction to accelerate the CRC32
disposal. This instruction present from Intel Westmere and
AMD Bulldozer CPUs.

Signed-off-by: Alexander Boyko <alexander_boyko@xyratex.com>
Reviewed-by: Alexander Zarochentsev <alexander_zarochentsev@xyratex.com>
Reviewed-by: Alexey Lyashkov <alexey_lyashkov@xyartex.com>
Xyratex-bug-id: MRP-314
Change-Id: Id6c88629f77cc5d389db49b7ee6e7111294c4a14
Reviewed-on: http://review.whamcloud.com/2586


Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>