[PATCH][AArch64] vec_pack_trunc_<mode> should split after register allocator

[Hurugalawadi, Naveen]

Hi,

>> I think we can split this whenever we like, and
>> that there isn't any benefit in keeping the pair together?

Thanks for the review and your views.

The patch is modified as per your suggestion.

Please review the patch and let me know if its okay?

Bootstrapped and Regression done on AArch64-Thunder-Linux.

Thanks,
Naveen   
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