[Patch, AArch64] Implement SIMD Absolute Difference Instructions

[Hurugalawadi, Naveen]

Hi Marcus,

>> The use of TAB there is fine.  The issue is that you have trail white
>> space at the end of the line, which is still present in the latest patch.

Sorry. I confused it with spaces at the start of pattern instead of 
trailing space. I have modified it as per your suggestion.
Please review the modified patch.

Thanks,
Naveen
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