RFR 8135028 - support for vectorizing double precision sqrt

[Berg, Michael C]

Hi Vladimir, as requested I have made a separate review for the sqrt vector changes.

I would like to contribute support for vectorizing double precision sqrt on Intel architectures. I need two reviewers to examine this patch and comment as needed:

Bug-id: https://bugs.openjdk.java.net/browse/JDK-8135028

webrev:
http://cr.openjdk.java.net/~mcberg/8135028/webrev.01/


These changes are made to add support to vectorize double precision sqrt which is available through the math library in scalar form.  The changes are for current and future Intel architectures.

Thanks,
Michael

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