RFR : PPC64 : Need support for VSR spills in ppc.ad

[Gustavo Romero]

Hi Martin,

I think Michi measured the effectivity of this change using SPECjbb2015 and got
about 4% of performance improvement in max-jOPS.

Many of our clients still use OpenJDK 8 and I understand that although currently
there isn't a new schedule ahead of 8u162 [1], 8 will continue to receive
updates once 8u162 is GA. So I would to backport it to jdk8u/jdk8u so distros
can grab it on the next security update (roughly). Are you ok with that?

If you are ok, since this change depends upon other changes that introduced the
support for VSX, is it fine if I start backporting them firstly instead
of this one? What do you recommend?

Thank you.


Regards,
Gustavo

[1] http://openjdk.java.net/projects/jdk8u/