[vector api] RFR: Implement vector max and min for AArch64 NEON

[Yang Zhang (Arm Technology China)]

Hi,

I have a patch which implements vector api max() and min() for AArch64 NEON. 
Could you please help to review this?

Webrev:
http://cr.openjdk.java.net/~yzhang/vectorapi.max_min/webrev.00/

Regards,
Yang