[vector api] RFR: Add Vector API mask support and comparisons for all data types for AArch64 NEON

[Vladimir Ivanov]

> I have a patch which adds Vector API mask operations support and implements comparisons for all data types for AArch64 NEON.
> Could you please help to review this?
> 
> Webrev:
> http://cr.openjdk.java.net/~yzhang/vectorapi.mask_cmp/webrev.00/

Looks fine, but I don't have enough expertise in AArch64 code base.

On a process note: you are free to set your own guidelines for 
AArch64-specific changes. It's safe to push such changes without risking 
affecting others' work and by now you should be all set to push the 
patches yourself.

Best regards,
Vladimir Ivanov