arch/86: AVX RAID5 xor checksumming v1

[Jim Kukunas]

Hi Folks,

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

This version differs from version 0, in that it:
	0) checks whether assembler supports AVX
	1) replaces __attribute__(aligned(32)) with __aligned(32)
	2) adds do/while(0); to macro blocks

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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