8386659: PPC: cleanup dtrace leftovers part 2

[dbriemann]

Dtrace is disabled on all ppc builds. This cleans up some more leftovers in the PPC specific code.

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• JDK-8386659: PPC: cleanup dtrace leftovers part 2 (Enhancement - P4)

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• 00: Full (f925f82b)

[TheRealMDoerr]

There's also

# if 0
  // DTrace method exit
# endif