RFR(M): 8144847: PPC64: Update Transactional Memory and Atomic::cmpxchg code

[Doerr, Martin]

Hi,

I have created a webrev for further PPC64 updates:
AIX supports Transactional Memory with a certain kernel patch level. Add a detection for it and make UseRTMLocking usable on AIX.
In addition, implement Atomic::cmpxchg for jbyte.

The webrev is here:
http://cr.openjdk.java.net/~mdoerr/8144847_ppc_updates/webrev.00/

Please review.

Best regards,
  Martin

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