RFR (M): 8165381 : Update for x86 SHA512 using AVX2

[Kamath, Smita]

Hi All,

I would like to contribute an optimization for SHA 512 towards JDK 9.1. This optimization shows ~2X improvement on X86_64 platforms.

Bug: https://bugs.openjdk.java.net/browse/JDK-8165381
Webrev: http://cr.openjdk.java.net/~vdeshpande/8165381/webrev.00/


Hotspot jtreg tests pass on Windows and Linux with this patch.

Please review and sponsor.


Thanks,
Smita Kamath
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