RFR : PPC64 : Need support for VSR spills in ppc.ad

[Michihiro Horie]

Hi Martin,

Would you review the following change that fixes the SLP for PPC?

In this change, I added support for VSR spills. Also, I fixed how to
specify registers in postalloc_expand for the float constant replication. I
confirmed this change works with JTREG.

Bug: https://bugs.openjdk.java.net/browse/JDK-8194861
webrev: http://cr.openjdk.java.net/~mhorie/8194861/webrev.00/
(I created a webrev under jdk/hs.)

Best regards,
--
Michihiro,
IBM Research - Tokyo
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