[8u-dev] RFR for non-clean backport of 8154156: PPC64: improve array copy stubs by using vector instructions

[Kazunori Ogata]

Hi,

May I get review for non-clean backport of 8154156: PPC64: improve array 
copy stubs by using vector instructions?

This is the same change as I posted in January [1], but I updated the 
patch based on the latest jdk8u-dev tree.  As we've had ppc-expert 
reviewers in jdk8u-dev community, I'd like to request for review.

Original patch: http://hg.openjdk.java.net/jdk/jdk/rev/c9d756fa846e
Weberv: http://cr.openjdk.java.net/~horii/jdk8u_aes_be/8154156/webrev.02/

I confirmed it was buildable for both release and fastdebug builds, and 
JTREG caused no degradation.

Refs: 
[1] 
https://mail.openjdk.java.net/pipermail/jdk8u-dev/2019-January/008372.html


Regards,
Ogata