SKL Fixes for VectorAPI

[Rukmannagari, Shravya]

Hi All,

I would like to contribute a patch for VectorAPI SKL fixes. The fixes are:

1)      maxAll intrinsic fix for Int512

2)      change in compare (contributed by Razvan)

3)      equal intrinsic for Byte256 (contributed by Vivek)

4)      vectorInsert intrinsic for AVX512

Could you please review the patch here:
http://cr.openjdk.java.net/~srukmannagar/VectorAPI_SKLFixes/webrev.00/



Thanks,
Shravya.