[aarch64-port-dev ] RFR: 8139043: aarch64: add support for adler32 intrinsic

[Edward Nevill]

Hi,

Please review the following webrev

http://cr.openjdk.java.net/~enevill/8139043/webrev/

Jira Issue: https://bugs.openjdk.java.net/browse/JDK-8139043

This webrev adds support for adler32 intrinsic on aarch64 in the same way that support for adler32 was added for Sparc recently (see https://bugs.openjdk.java.net/browse/JDK-8132081)

Testing using TestAdler32.java from jtreg test suite shows between 60% and 155% improvement depending on the size of buffer.

Tested with jtreg hotspot. Results the same before and after patch (Test results: passed: 896; failed: 6; error: 10)

Thanks for your help,
Ed