RFR(S) JDK-8205528: Base64 Encode Algorithm using AVX512 Instructions

[Kamath, Smita]

Hi Vladimir,

I'd like to contribute an optimization for Base64 Encoding Algorithm using AVX512 Instructions. This optimization shows 1.5x improvement on x86_64 platform(SKL).

Link to Bug: https://bugs.openjdk.java.net/browse/JDK-8205528

Link to webrev: http://cr.openjdk.java.net/~vdeshpande/Base64/webrev.00/

For testing the implementation, I have run tests under test/jdk/java/util/Base64/ and also ran test/jdk/com/sun/jndi/ldap/Base64Test.java

I have also run jtreg.

Please review and let me know if you have any comments.

Thanks and Regards,
Smita
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