arch/86: AVX RAID5 xor checksumming

[Jim Kukunas]

Hi Folks,

The following patch adds an AVX implementation of the RAID5 xor checksumming
functions.

Based on xor_speed, the AVX implementation appears to be ~32% faster than the
SSE implementation on my i7 2600:

        generic_sse: 15088.000 MB/sec
	avx: 19936.000 MB/sec

Thanks.

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