RFR: 8215262: PPC64: FMA Vectorization on PPC64

Dear all, Would you please review the following change? This change supports FMA vectorization on PPC64. Bug: https://bugs.openjdk.java.net/browse/JDK-8215262 Webrev: http://cr.openjdk.java.net/~mhorie/8215262/webrev.00/ Microbenchmark I used is http://cr.openjdk.java.net/~mhorie/8215262/VFma.java It showed ~50% reduction in the execution time. I also tested with JTREG and there was no difference in the results compared to the original. Best regards, -- Michihiro, IBM Research - Tokyo