RFR(M): 8181616: FMA Vectorization on x86

[Deshpande, Vivek R]

Hi All

The enhancement generates Vector FMA instructions using SuperWord Analysis for X86.
We observed upto 6x gain on Skylake and KNL using 512 bit Vector FMA instructions using FMA API operating on independent arrays.
Webrev:
http://cr.openjdk.java.net/~vdeshpande/8181616/webrev.00/
I have also updated the JBS entry.
https://bugs.openjdk.java.net/browse/JDK-8181616
Would you please review and sponsor it.

Regards,
Vivek

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