[aarch64-port-dev ] RFR: JDK8: Add Support for SHA intrinsics

[Edward Nevill]

Hi,

The following webrev adds support for SHA-1 and SA-256 intrinsics using 
AArch64 SHA instructions.

http://cr.openjdk.java.net/~enevill/141117/webrev.00

Tested with jtreg hotspot and langtools with no regressions.

Performance testing using 1E6 iterations of TestSHA from jtreg shows 
6.75X performance improvement on SHA-1 and 9X performance improvement on 
SHA-2.

OK to push to JDK8 and JDK9?

All the best,
Ed.