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  1. JDK
  2. JDK-8144847

PPC64: Update Transactional Memory and Atomic::cmpxchg code

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      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.

            mdoerr Martin Doerr
            mdoerr Martin Doerr
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