[PATCH] [AArch64] Implement popcount pattern

[Hurugalawadi, Naveen]

Hi Kyrill,

Thanks for reviewing the patch and your useful comments.

>> looks good to me if it has gone through the normal required
>> bootstrap and testing, but I can't approve.

Bootstrapped and Regression Tested on aarch64-thunderx-linux.

>> The rest of the MD file uses the term AdvSIMD. Also, the instrurction
>> is CNT rather than "pop count".

Done.

>> __builtin_popcount takes an unsigned int, so this should be 
>> scanning for absence of popcountsi2 instead?

Done.

Please find attached the modified patch as per review comments
and let me know if its okay for Stage-1 or current branch.

Thanks,
Naveen
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