RFR(M): 8224826: Implement fast class initialization checks on PPC64

[Doerr, Martin]

Hi,

please review the PPC64 implementation of JDK-8223213:
http://cr.openjdk.java.net/~mdoerr/8224826_ppc64_fast_clinit/webrev.00/

x86 changeset: http://hg.openjdk.java.net/jdk/jdk/rev/9ad765641e8f

Best regards,
Martin