RFR: JDK-8277175 : Add a parallel multiply method to BigInteger [v10]

[kabutz]

On Wed, 9 Feb 2022 22:48:57 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> > A question about wording of the @implNote. In multiply() they say: "An implementation may offer better algorithmic ...", but we changed this to "This implementation may offer better algorithmic ..." I've kept it as "This implementation may ...", but what is the better way of writing such implementation notes?
> 
> I usually refer to "This implementation or this method" mostly out of habit of writing a bunch of these notes in `java.util`. I am fine with either approach.

That makes sense - thank you so much for your patience :-)

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PR: https://git.openjdk.java.net/jdk/pull/6409