Backport performance enhancement to jdk8

[Bruno Alexandre Rosa]

Hi, everyone,

Recently our team implemented the missing mulAdd and squareToLen intrinsics on ppc64. Our initial approach does not use vector instructions, but we are also looking into that.
Running SPECjvm2008's crypto.rsa benchmark on jdk9 we got around 4% performance gain. Backporting it to jdk8 we noticed a more remarkable ~56% gain.

We think that this gain justifies a backport. However, we are also aware that patches are backported mainly when they address bugfixes. Would this be acceptable for the community?

Regards,
Bruno Rosa

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