[Patch, AArch64] Implement SIMD Absolute Difference Instructions

[Hurugalawadi, Naveen]

Hi Marcus,

Thanks for reviewing the patch and your comments.

>> Please drop the trailing white space, here and on the following 
>> patterns.
The trailing white spaces are observed only in the patch. When the
patch is applied on sources, there are no trailing white spaces.

>> GNU style, spaces around '=' and '<'.
Sorry for missing the indentation part. Spaces have been added
wherever needed.

Please review the modified patch and let me know if there should be 
any further modifications?

Thanks,
Naveen
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