RFR(L): Vector API Compare Intrinsics

[Lupusoru, Razvan A]

Hi everyone,

Rahul and I have implemented all the code sequences for compares (<,>,<=,>=,==,!=) for all vector types and sizes. Please take a look at the patch:
http://cr.openjdk.java.net/~rlupusoru/panama/webrev_veccompares_04/

Please note that I also added the necessary tests to exercise this functionality. Likely they can be cleaned up once the infrastructure has a template for using data providers.

Thanks,
Razvan